APA (7th ed.) Zitazioa

Sims, G. (1972). The Sand dollar. Penguin.

Chicago Style (17th ed.) Zitazioa

Sims, George. The Sand Dollar. Harmonds-worth: Penguin, 1972.

MLA (9th ed.) Zitazioa

Sims, George. The Sand Dollar. Penguin, 1972.