Cita APA (7a ed.)

Willer, D., & Truesdell, W. H. (2015). PHR/SPHR: Professional in human resources certification : exam guide. McGraw-Hill Education.

Cita Chicago Style (17a ed.)

Willer, Dory, y William H. Truesdell. PHR/SPHR: Professional in Human Resources Certification : Exam Guide. New York: McGraw-Hill Education, 2015.

Cita MLA (8a ed.)

Willer, Dory, y William H. Truesdell. PHR/SPHR: Professional in Human Resources Certification : Exam Guide. McGraw-Hill Education, 2015.