APA
Bureau of Agricultural Research, Department of Agriculture, . (1991). On-farm research manual. Diliman, Quezon City: Bureau of Agricultural Research, Department of Agriculture.
Chicago
Bureau of Agricultural Research, Department of Agriculture, . 1991. On-farm research manual. Diliman, Quezon City: Bureau of Agricultural Research, Department of Agriculture.
Harvard
Bureau of Agricultural Research, Department of Agriculture, . (1991). On-farm research manual. Diliman, Quezon City: Bureau of Agricultural Research, Department of Agriculture.
MLA
Bureau of Agricultural Research, Department of Agriculture, . On-farm research manual. Diliman, Quezon City: Bureau of Agricultural Research, Department of Agriculture. 1991.