When the author is the same as the publisher, omit the publisher from the entry.
American Psychological Association. (2010). Publication manual of the American Psychological Association (6th ed.).
American Psychological Association.
Write the publisher’s name as it appears in the work, do not abbreviate. Follow faithfully any capitalization, and omit business words like Ltd., Inc. LLC. Use the imprint or division name, and if there are two or more publishers include them as they appear on the copyright page. Separate with a semicolon.
Cohen, D. H. (2016). Observing and recording the behavior of young children (6th ed.). Teachers College Press.
Levine, L. E., & Munsch, J. (2010). Child development: An active learning approach. SAGE Publications.
Shore, R. (2015). Developing young minds: From conception to kindergarten. Rowman & Littlefield Publishers.
(American Psychological Association, 2020, pp. 295-296, 324)