Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (9ú heag.)

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

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