This is what an APA citation looks like.
In-text citation:
Parents should be concerned about online advertising. These advertisers are manipulative, and children are more vulnerable than most parents expect (Cornish, 2014, p. 454).
References page:
Cornish, L. S. (2014). 'Mum, can I play on the internet?' Parents' understanding, perception and responses to online advertising designed for children. International Journal of Advertising, 33(3), 437-473.
Citations will have different formats depending on what you're citing (a book, an article from a database, a video, etc.). Want to see more examples of APA citations? Go to APA Referencing Guide