APA aipamena

Colis, O. L. 1. (1972). Programmed instruction in farmers' cooperative. s. n.

Chicago Style aipamena

Colis, Oscar Loyola 1936. Programmed Instruction in Farmers' Cooperative. College, Laguna: s. n, 1972.

MLA aipamena

Colis, Oscar Loyola 1936. Programmed Instruction in Farmers' Cooperative. s. n, 1972.