Cita APA

Gregorio, E. G. (1980). A practical guide to irrigation canal design. Philippine Engineering Journal.

Citación estilo Chicago

Gregorio, Enrico G. "A Practical Guide to Irrigation Canal Design." Philippine Engineering Journal 1980.

Cita MLA

Gregorio, Enrico G. "A Practical Guide to Irrigation Canal Design." Philippine Engineering Journal, 1980.

Warning: These citations may not always be 100% accurate.