APA-referens (7:e uppl.)

De Vera, A. F., Wang, T., & Traya, L. A. (1992). An Information system study of the SPMO Procurement Section. College of Engineering.

Chicago-referens (17:e uppl.)

De Vera, Augusto Francis, Ting Wang, och Lloyd Apollo Traya. An Information System Study of the SPMO Procurement Section. Diliman, Quezon City: College of Engineering, 1992.

MLA-referens (9:e uppl.)

De Vera, Augusto Francis, et al. An Information System Study of the SPMO Procurement Section. College of Engineering, 1992.