Gaya APA

C.Steffens, D, G, D. (2009). Textbook of Geriatric Psychiatry (4). : American Psychiatric Pubh.

Gaya MLA

C.Steffens, Dan, G.Blazer;, David. "Textbook of Geriatric Psychiatry". 4 : American Psychiatric Pubh, 2009. Text.