APA aipamena

Sharkey, B. J., & Davis, P. O. (2008). Hard work: Defining physical work performance requirements. Human Kinetics.

Chicago Style aipamena

Sharkey, Brian J., and Paul O. Davis. Hard Work: Defining Physical Work Performance Requirements. Champaign, Ill: Human Kinetics, 2008.

MLA aipamena

Sharkey, Brian J., and Paul O. Davis. Hard Work: Defining Physical Work Performance Requirements. Human Kinetics, 2008.