New Guidelines for All Reference Types
The number of authors included in a reference entry
has changed:
• Provide surnames and initials for up to and
including 20 authors. When there are two to 20
authors, use an ampersand before the nal author’s
name: Author, A. A., Author, B. B., & Author, C. C.
• When there are 21 or more authors, include the
rst 19 authors’ names, insert an ellipsis (but no
ampersand), and then add the nal author’s name.
EXAMPLE WITH 21+ AUTHORS
Kalnay, E., Kanamitsu, M., Kistler, R., Collins, W.,
Deaven, D., Gandin, L., Iredell, M., Saha, S., White,
G., Woollen, J., Zhu, Y., Chelliah, M., Ebisuzaki, W.,
Higgins, W., Janowiak, J., Mo, K. C., Ropelewski,
C., Wang, J., Leetmaa, A., . . . Joseph, D. (1996).
The NCEP/NCAR 40-year reanalysis project. Bulle-
tin of the American Meteorological Society, 77(3),
437– 471. https://doi.org/10.1175/1520-0477(1996)0
77%3C0437:TNYRP%3E2.0.CO;2
For more on why this change was made, see the blog
post on the number of authors to include in a reference.
• The presentation of DOIs and URLs has been
standardized.
°
Both are presented as hyperlinks.
°
The label “DOI:” is no longer used before a DOI.
DOIs should begin with the prex https://doi.org/
°
The words “Retrieved from” are used before a
URL only when a retrieval date is also needed;
otherwise, URLs are presented without a label.
°
The APA Style website also contains guidance
on DOIs and URLs.
• For any reference with a publisher or a site name:
°
When the author name and the publisher are an
exact match, the publisher is omitted.
°
The word “Author” is no longer included
in the source element of the reference as a
replacement as in the sixth edition.
EXAMPLE
American Psychiatric Association. (2013). Diag-
nostic and statistical manual of mental disor-
ders (5th ed.). https://doi.org/10.1176/appi.
books.9780890425596
NOT
American Psychiatric Association. (2013). Diagnos-
tic and statistical manual of mental disorders
(5th ed.). Author. https://doi.org/10.1176/appi.
books.9780890425596
NOT
American Psychiatric Association. (2013). Diagnos-
tic and statistical manual of mental disorders (5th
ed.). American Psychiatric Association. https://
doi.org/10.1176/appi.books.9780890425596
The author name in this reference (American Psychi-
atric Association) is also the name of the publisher, so
the name appears only once in the reference (in the
author element). The source element of the reference
includes only the DOI.
• The seventh edition includes expanded guidelines
and examples for citing works that are written in
another language (see Sections 9.38 and 9.39 as
well as the examples in Chapter 10).
10.1 Journal Articles
• When an issue number is present, always include it
(in parentheses and not italicized) after the volume
number.
EXAMPLE
Grady, J. S., Her, M., Moreno, G., Perez, C., &
Yelinek, J. (2019). Emotions in storybooks: A
comparison of storybooks that represent ethnic
and racial groups in the United States. Psychol-
ogy of Popular Media Culture, 8(3), 207–217.
https://doi.org/10.1037/ppm0000185
• If a journal uses article numbers, include the word
“Article” and the number instead of any page range.
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