Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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