APA stands for Asian Psychological Association.

If a book has 15 authors, include only the first three authors.

If there are 20 authors, include all the authors in the citation.

If there are more than 20 authors, list down the 19 authors and the last author only.

In a reference with more than twenty authors, separate the listing of the first 19 authors with the last author with an ampersand.

In writing the reference, first name comes first before the last name of the author.

In a book reference, the title of the book should be written in Italics.

In a book reference, the location of publication and the publisher are separated by a hyphen(-).

In writing the name of an author, the surname is written first followed by the first name, both are written completely.