Precise citations are extremely important. They give credit to the authors of the work you have consulted, and provide a way for others to find the same sources that you have used. Incorrect or incomplete citations are seen by some institutions and publishers as plagiarism.
The style of citation depends on the preferences of your discipline, instructor, and/or publisher. Information that must be included in any citation of United Nations archival material is:
Repository: United Nations Archives Geneva (can be further abbreviated to UNOG Archives after the first mention)