Παραπομπή σε μορφή APA (7η εκδ.)

Denning, G. L. (1980). Rainfed cropping systems in Zamboanga Del Sur: A farm survey. Zamboanga Del Sur Development Project, Philippine-Australian Development Assistance Programme.

Παραπομπή σε μορφή Chicago (17η εκδ.)

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.

Παραπομπή σε μορφή MLA (9th εκδ.)

Denning, Glenning L. Rainfed Cropping Systems in Zamboanga Del Sur: A Farm Survey. Zamboanga Del Sur Development Project, Philippine-Australian Development Assistance Programme, 1980.