Castro, P. P. M. (1990). Calibration of the sysops computer model. Philippine Engineering Journal.
Cita Chicago (17th ed.)Castro, Peter Paul M. "Calibration of the Sysops Computer Model." Philippine Engineering Journal 1990.
Cita MLA (9th ed.)Castro, Peter Paul M. "Calibration of the Sysops Computer Model." Philippine Engineering Journal, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.