Denning, G. L. (1980). Rainfed cropping systems in Zamboanga Del Sur: A farm survey. Zamboanga Del Sur Development Project, Philippine-Australian Development Assistance Programme.
Citace podle Chicago (17th ed.)Denning, Glenning L. Rainfed Cropping Systems in Zamboanga Del Sur: A Farm Survey. [Pagadian City]: Zamboanga Del Sur Development Project, Philippine-Australian Development Assistance Programme, 1980.
Citace podle MLA (9th ed.)Denning, Glenning L. Rainfed Cropping Systems in Zamboanga Del Sur: A Farm Survey. Zamboanga Del Sur Development Project, Philippine-Australian Development Assistance Programme, 1980.
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