Cita APA (7a ed.)

Callaway, M. B., & Francis, C. A. (1993). Crop improvement for sustainable agriculture. University of Nebraska.

Cita Chicago Style (17a ed.)

Callaway, M. Brett, y Charles A. Francis. Crop Improvement for Sustainable Agriculture. Nebraska: University of Nebraska, 1993.

Cita MLA (8a ed.)

Callaway, M. Brett, y Charles A. Francis. Crop Improvement for Sustainable Agriculture. University of Nebraska, 1993.