Citing sources occurs both in the body of your paper or presentation and at the end in a list of references.
In an APA formatted paper the bibliography is titled "References"
In a MLA formatted paper the bibliography is titled "Works Cited"
Tynes argues persuasively that "the records and statistics of any person testing positive for a banned substance should no longer be recognized as valid by the MLB" (2006, p. 508).
Tynes, J. R. (2006). Performance enhancing substances: Effects, regulations, and the pervasive efforts to control doping in major league baseball. Journal of Legal Medicine, 27, 493-509.