APA (7th ed.) Citation

De Leon, S. O. (1979). Security guard's manual. JMC Press.

Chicago Style (17th ed.) Citation

De Leon, Sixto O. Security Guard's Manual. Quezon City: JMC Press, 1979.

MLA (9th ed.) Citation

De Leon, Sixto O. Security Guard's Manual. JMC Press, 1979.