Gaya APA

Birney, B, G. (2014). Secrets according to Humphrey . New York: G. P. Putnam's Sons, an imprint of Penguin Group (USA).

Gaya MLA

Birney, Betty, G.,. "Secrets according to Humphrey". New York: G. P. Putnam's Sons, an imprint of Penguin Group (USA), 2014. Text.