APA (7th ed.) Citation

Penney, S. (2012). The invisible ones. G.P. Putnam's Sons.

Chicago Style (17th ed.) Citation

Penney, Stef. The Invisible Ones. New York: G.P. Putnam's Sons, 2012.

MLA (8th ed.) Citation

Penney, Stef. The Invisible Ones. G.P. Putnam's Sons, 2012.

Warning: These citations may not always be 100% accurate.