Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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