Cita APA (7th ed.)

SIMS, J. A., & JOHNSON, L. E. (1972). Animals in the American economy. The Iowa State University.

Cita Chicago (17th ed.)

SIMS, John A., i Leslie E. JOHNSON. Animals in the American Economy. Iowa: The Iowa State University, 1972.

Cita MLA (9th ed.)

SIMS, John A., i Leslie E. JOHNSON. Animals in the American Economy. The Iowa State University, 1972.