Gaya APA

Piskurich, G, M. (2002). HPI essentials : a just the facts, bottom-line primer on human performance improvement . United States of America: Astd Press.

Gaya MLA

Piskurich, George, M.. "HPI essentials : a just the facts, bottom-line primer on human performance improvement". United States of America: Astd Press, 2002. .