Periodicals include items published on a regular basis such as journals, magazines, newspapers, and newsletters.

• Include the digital object identifier (DOI) in the reference if one is assigned (see section 6.31)
• If no DOI is assigned to the content and you retrieved it online, include the home page URL for the journal, newsletter, or magazine in the reference. Use this format: Retrieved from URL
• If each issue of a journal begins on page 1, give the issue number in parentheses immediately after the volume number.
• If you are citing an advance release version of the article, insert Advance online publication before the retrieval statement.
• Some journals offer supplemental material that is available only online. To reference this supplemental material, or any other nonroutine information that is important for identification and retrieval, include a description of the content in brackets following the title: [Letter to the editor] [Map] [Audio podcast]
• If the original version of a non-English article is used as the source, cite the original version. Give the original title and, in brackets, the English translation.
• If the English translation of a non-English article is used as the source, cite the English translation. Give the English title without brackets.

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