APA (7th ed.) Zitazioa

Smart, J. D., & J.M. Swanson. A Promise to keep. Westminster Press.

Chicago Style (17th ed.) Zitazioa

Smart, James D., eta J.M. Swanson. A Promise to Keep. Philadelphia: Westminster Press.

MLA (9th ed.) Zitazioa

Smart, James D., eta J.M. Swanson. A Promise to Keep. Westminster Press.