APA requires both in-text citations and a reference list at the end of a paper
The author-date system is used for in-text citations. (see In-text Citations tab for more information)
The reference list provides a list of all sources used in the paper; sources are listed alphabetically.(see Reference List tab for more information)
The APA Style Blog is an excellent resource to use in addition the the APA Manual. It can be found here, http://blog.apastyle.org/apastyle/ and can be searched with a search box which appears in the upper right of the page.
Publication Manual of the American Psychological Association by 