Gaya APA

Chetwynd, J. (2011). Secret history of balls : the stories behind the things we love to catch, whack, throw, kick, bounce, and bat . New York: Penguin Books.

Gaya MLA

Chetwynd, Josh. "Secret history of balls : the stories behind the things we love to catch, whack, throw, kick, bounce, and bat". New York: Penguin Books, 2011. Text.