APA Style

Green, John. (201). An abundance of Katherines / John Green . New York: Speak.

Chicago Style

Green, John. An abundance of Katherines / John Green. New York: Speak, 201. Text.

MLA Style

Green, John. An abundance of Katherines / John Green. New York: Speak, 201. Text.

Turabian Style

Green, John. An abundance of Katherines / John Green. New York: Speak, 201. Print.