Παραπομπή APA

Green, J. (2017). Turtles all the way down. Penguin.

Παραπομπή Chicago Style

Green, John. Turtles All the Way Down. Kunited Kingdom: Penguin, 2017.

Παραπομπή MLA

Green, John. Turtles All the Way Down. Penguin, 2017.