Specific Rules #3 for Title (required) for the Volume for Individual Volumes With a Separate Title and Separate Authors/Editors Vancouver Style: Titles in more than one language

If a book title is written in several languages:

Give the title in the first language found on the title page.

List all languages of publication after the pagination (or Physical Description, if provided).

Separate the languages by commas.

End the list of languages with a period.

If a book is published with equal text in two or more languages, as often occurs in Canadian publications:

Give all titles in the order they are given in the text.

Place an equals sign with a space on either side between each title.

List all languages, separated by commas, after the pagination (or Physical Description, if provided).

End the list of languages with a period.

Según:

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

Related:

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

Specific Rules #1 for Title (required) for the Volume for Individual Volumes With a Separate Title and Separate Authors/Editors Vancouver Style: Titles containing a Greek letter, chemical formula, or another special character

Specific Rules #2 for Title (required) for the Volume for Individual Volumes With a Separate Title and Separate Authors/Editors Vancouver Style: Titles not in English

Specific Rules #3 for Title (required) for the Volume for Individual Volumes With a Separate Title and Separate Authors/Editors Vancouver Style: Titles in more than one language

Specific Rules #4 for Title (required) for the Volume for Individual Volumes With a Separate Title and Separate Authors/Editors Vancouver Style: Titles ending in punctuation other than a period

Specific Rules #5 for Title (required) for the Volume for Individual Volumes With a Separate Title and Separate Authors/Editors Vancouver Style: No title can be found

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