If you wish to cite more than one source in one citation, alphabetize the last names of the authors and separate the citations with semi-colons as pictured below.
Parenthetical Citation Example
Eye-witness accounts do not constitute unbiased information because they are filtered through the lenses of memory and worldview (Adshead-Lansdale & Layson, 2006, p. 14; Perks & Thomson, 2006, p. 48; Vansina, 1985, p. 5).
Many sources you read will have quotations and paraphrases. It is ideal to locate and cite the original. If that is not possible, you may cite as a secondary source.
Parenthetical Citation Example
Narrative Citation Example