Cita APA (7a ed.)

Montgomery, E. G., & Gregory, R. W. (1938). Productive farm crops (5th. ed. rev.). Lippincott.

Cita Chicago Style (17a ed.)

Montgomery, E. G., y R. W. Gregory. Productive Farm Crops. 5th. ed. rev. Chicago: Lippincott, 1938.

Cita MLA (8a ed.)

Montgomery, E. G., y R. W. Gregory. Productive Farm Crops. 5th. ed. rev. Lippincott, 1938.