Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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