Gill, G. J., & Ahmed, I. (1977). The green revolution and tractorisation: A comment. International Labour Organization.
Citazione stile Chigago Style (17a edizione)Gill, Gerard J., e Iftikhar Ahmed. The Green Revolution and Tractorisation: A Comment. International Labour Organization, 1977.
Citatione MLA (9a ed.)Gill, Gerard J., e Iftikhar Ahmed. The Green Revolution and Tractorisation: A Comment. International Labour Organization, 1977.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.