Gaya APA

Birney, B, G., Burris, P. (2014). Humphrey's: playful puppy problem . New York: Puffin Books - Penguin Group.

Gaya MLA

Birney, Betty, G.., Burris, Priscilla. "Humphrey's: playful puppy problem". New York: Puffin Books - Penguin Group, 2014. Text / Book.