APA-referens (7:e uppl.)

Duka, C. D., Duka, C. R., & Briones, D. C. (2006). Reviewer for the civil service examination: Professional and subprofessional levels (2nd ed.). Manila Review Institute.

Chicago-referens (17:e uppl.)

Duka, Cecilio D., Carolina R. Duka, och Darna C. Briones. Reviewer for the Civil Service Examination: Professional and Subprofessional Levels. 2nd ed. Manila: Manila Review Institute, 2006.

MLA-referens (9:e uppl.)

Duka, Cecilio D., et al. Reviewer for the Civil Service Examination: Professional and Subprofessional Levels. 2nd ed. Manila Review Institute, 2006.