Cita APA (7th ed.)

Sangalang, L. P. J. (1982). A product mix optimization model. Philippine Engineering Journal.

Cita Chicago (17th ed.)

Sangalang, Leonardo P. Jr. "A Product Mix Optimization Model." Philippine Engineering Journal 1982.

Cita MLA (9th ed.)

Sangalang, Leonardo P. Jr. "A Product Mix Optimization Model." Philippine Engineering Journal, 1982.