Specific Rules #2 for Place of Publication (required) for the Volume for Individual Volumes With a Separate Title and Separate Authors/Editors Vancouver Style: Joint publication

Two or more organizations may co-publish a book.

Use the city of the first organization found on the title page (or on the back of the title page if no place information appears on the title page), as the place of publication.

Place the name of the other organization(s) as a note at the end of the citation, if desired.

Co-published by the Canadian Medical Association.

Do not give multiple places as place of publication or include multiple publishers.

Según:

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

Related:

General Rules for Place of Publication (required) for the Volume for Individual Volumes With a Separate Title and Separate Authors/Editors Vancouver Style

Specific Rules #1 for Place of Publication (required) for the Volume for Individual Volumes With a Separate Title and Separate Authors/Editors Vancouver Style: Non-US cities

Specific Rules #2 for Place of Publication (required) for the Volume for Individual Volumes With a Separate Title and Separate Authors/Editors Vancouver Style: Joint publication

Specific Rules #3 for Place of Publication (required) for the Volume for Individual Volumes With a Separate Title and Separate Authors/Editors Vancouver Style: Multiple places of publication

Specific Rules #4 for Place of Publication (required) for the Volume for Individual Volumes With a Separate Title and Separate Authors/Editors Vancouver Style: No place of publication can be found

Examples for Place of Publication (required) for the Volume for Individual Volumes With a Separate Title and Separate Authors/Editors Vancouver Style