Cita APA (7a ed.)

Nixon, E. (1931). The Principles of potato production. Orange Judd.

Cita Chicago Style (17a ed.)

Nixon, E.L. The Principles of Potato Production. New York: Orange Judd, 1931.

Cita MLA (8a ed.)

Nixon, E.L. The Principles of Potato Production. Orange Judd, 1931.