Valiente, A. M. (1978). Operations of harvesters and threshers: Bicol. Special Studies Division, Department of Agriculture.
Citazione stile Chigago Style (17a edizione)Valiente, A. M. Operations of Harvesters and Threshers: Bicol. Quezon City: Special Studies Division, Department of Agriculture, 1978.
Citatione MLA (9a ed.)Valiente, A. M. Operations of Harvesters and Threshers: Bicol. Special Studies Division, Department of Agriculture, 1978.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.