C. J. Pearson
Stephen R. Gliessman
Cynthia A. Grant
Unknown Author
Henri Louis Duhamel du Monceau
Palit K., Ph.D. Kataki
Institut de l'environnement et de recherches agricoles (Burkina Faso)
Felix Hurtado Huamán
Floyd E. Bolton
Crop Conference, National Institute of Agricultural Botany (19th 1986 Cambridge)
Otto C. Doering
B. Sundara
Gurbir S. Bhullar
Haryana (India). Economic and Statistical Organisation.
Majid Husain
National Council of Applied Economic Research
Food and Agriculture Organization of the United Nations
A. C. Arny