Cita APA (7a ed.)

Chopra, V. L., Singh, R. B., & Varma, A. (1998). Crop productivity and sustainability: Shaping the future. Oxford and IBH Publishing.

Cita Chicago Style (17a ed.)

Chopra, V. L., R. B. Singh, y Anupam Varma. Crop Productivity and Sustainability: Shaping the Future. New Delhi: Oxford and IBH Publishing, 1998.

Cita MLA (8a ed.)

Chopra, V. L., et al. Crop Productivity and Sustainability: Shaping the Future. Oxford and IBH Publishing, 1998.