Παραπομπή APA

Philippines, & Bureau of Agricultural Research. (1991). On-farm research manual: The farming systems approach. Quezon City, Philippines: Bureau of agricultural research.

Παραπομπή Chicago Style

Philippines, και Bureau of Agricultural Research. On-farm Research Manual: The Farming Systems Approach. Quezon City, Philippines: Bureau of agricultural research, 1991.

Παραπομπή MLA

Philippines, και Bureau of Agricultural Research. On-farm Research Manual: The Farming Systems Approach. Quezon City, Philippines: Bureau of agricultural research, 1991.

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