Specific Rules #4 for Date of Publication (required) to Citing Entire Reports Vancouver Style: No date of publication, but a date of copyright

Reports by US government agencies are not copyrighted, but reports issued by the agencies of other countries and those published by performing organizations may be copyrighted. A copyright date is identified by the symbol ©, the letter "c", or the word copyright preceding the date.

If no date of publication can be found, but the publication contains a date of copyright, use the date of copyright preceded by the letter "c"; for example c2005.

Examples:

Framarin A. First-trimester prenatal screening for Down syndrome and other aneuploidies. Wickens M, translator. Montreal (QC): Agence d'Evaluation des Technologies et des Modes d'Intervention en Sante (CA); c2003. 81 p. Report No.: AETMIS 03-01.

Rosenbaum, S, Smith BM, Shin P, Zakheim MH, Shaw K, Sonosky CA, Repasch L. Negotiating the new health system: a nationwide study of Medicaid managed care contracts. 2nd ed. Johnson K, editor. Washington: George Washington University Medical Center, Center for Health Policy Research; c1998. 2 vols.

Según:

Citing Medicine: The NLM Style Guide for Authors, Editors, and Publishers [Internet]. 2nd edition. Chapter 4: Scientific and Technical Reports