Lena Peters, 'Up-to-date as of 9 February 2011' (2011), pp. 1–1, in Wouters Prof. Dr Jan (Volume Editor), Roger Blanpain (General Editor), Michele Colucci (Associate General Editor) International Encyclopaedia for Intergovernmental Organizations (Kluwer Law International, The Netherlands)

Lena Peters, 'The Author' (2011), pp. 3–4, in Wouters Prof. Dr Jan (Volume Editor), Roger Blanpain (General Editor), Michele Colucci (Associate General Editor) International Encyclopaedia for Intergovernmental Organizations (Kluwer Law International, The Netherlands)

Lena Peters, 'Table of Contents' (2011), pp. 5–10, in Wouters Prof. Dr Jan (Volume Editor), Roger Blanpain (General Editor), Michele Colucci (Associate General Editor) International Encyclopaedia for Intergovernmental Organizations (Kluwer Law International, The Netherlands)

Lena Peters, 'List of Abbreviations' (2011), pp. 11–12, in Wouters Prof. Dr Jan (Volume Editor), Roger Blanpain (General Editor), Michele Colucci (Associate General Editor) International Encyclopaedia for Intergovernmental Organizations (Kluwer Law International, The Netherlands)

Lena Peters, 'Part I. Genesis and Historical Development' (2011), pp. 13–16, in Wouters Prof. Dr Jan (Volume Editor), Roger Blanpain (General Editor), Michele Colucci (Associate General Editor) International Encyclopaedia for Intergovernmental Organizations (Kluwer Law International, The Netherlands)

Lena Peters, 'Part II. Institutional Framework' (2011), pp. 17–28, in Wouters Prof. Dr Jan (Volume Editor), Roger Blanpain (General Editor), Michele Colucci (Associate General Editor) International Encyclopaedia for Intergovernmental Organizations (Kluwer Law International, The Netherlands)

Lena Peters, 'Part III. Activities' (2011), pp. 29–76, in Wouters Prof. Dr Jan (Volume Editor), Roger Blanpain (General Editor), Michele Colucci (Associate General Editor) International Encyclopaedia for Intergovernmental Organizations (Kluwer Law International, The Netherlands)

Lena Peters, 'Part IV. Cooperation with Other International Organizations' (2011), pp. 77–78, in Wouters Prof. Dr Jan (Volume Editor), Roger Blanpain (General Editor), Michele Colucci (Associate General Editor) International Encyclopaedia for Intergovernmental Organizations (Kluwer Law International, The Netherlands)

Lena Peters, 'Selected Bibliography' (2011), pp. 79–110, in Wouters Prof. Dr Jan (Volume Editor), Roger Blanpain (General Editor), Michele Colucci (Associate General Editor) International Encyclopaedia for Intergovernmental Organizations (Kluwer Law International, The Netherlands)

Lena Peters, 'Appendix 1. Studies Prepared by Unidroit' (2011), pp. 111–114, in Wouters Prof. Dr Jan (Volume Editor), Roger Blanpain (General Editor), Michele Colucci (Associate General Editor) International Encyclopaedia for Intergovernmental Organizations (Kluwer Law International, The Netherlands)

Lena Peters, 'Appendix 2. Instruments Adopted or Prepared by Unidroit' (2011), pp. 115–116, in Wouters Prof. Dr Jan (Volume Editor), Roger Blanpain (General Editor), Michele Colucci (Associate General Editor) International Encyclopaedia for Intergovernmental Organizations (Kluwer Law International, The Netherlands)

Lena Peters, 'Appendix 3. Unidroit Publications' (2011), pp. 117–124, in Wouters Prof. Dr Jan (Volume Editor), Roger Blanpain (General Editor), Michele Colucci (Associate General Editor) International Encyclopaedia for Intergovernmental Organizations (Kluwer Law International, The Netherlands)

Lena Peters, 'Appendix 4. Depositary Libraries for Unidroit Documentation' (2011), pp. 125–128, in Wouters Prof. Dr Jan (Volume Editor), Roger Blanpain (General Editor), Michele Colucci (Associate General Editor) International Encyclopaedia for Intergovernmental Organizations (Kluwer Law International, The Netherlands)

Lena Peters, 'Appendix 5. The Unidroit Web Site' (2011), pp. 129–130, in Wouters Prof. Dr Jan (Volume Editor), Roger Blanpain (General Editor), Michele Colucci (Associate General Editor) International Encyclopaedia for Intergovernmental Organizations (Kluwer Law International, The Netherlands)

Lena Peters, 'Subject Index' (2011), pp. 131–138, in Wouters Prof. Dr Jan (Volume Editor), Roger Blanpain (General Editor), Michele Colucci (Associate General Editor) International Encyclopaedia for Intergovernmental Organizations (Kluwer Law International, The Netherlands)