Cita APA (7a ed.)

Zenfell, M. E., & Savage, i. A. (1989). E.U.A. Edinter.

Cita Chicago Style (17a ed.)

Zenfell, Martha Ellen, y il. Ann Savage. E.U.A. Edinter, 1989.

Cita MLA (8a ed.)

Zenfell, Martha Ellen, y il. Ann Savage. E.U.A. Edinter, 1989.