Robertson. (2004). Perceived exertion for practitioners: Rating effort with the OMNI picture system. Champaign IL: Human Kinetic.
Chicago Style CitationRobertson. Perceived Exertion for Practitioners: Rating Effort With the OMNI Picture System. Champaign IL: Human Kinetic, 2004.
MLA CitationRobertson. Perceived Exertion for Practitioners: Rating Effort With the OMNI Picture System. Champaign IL: Human Kinetic, 2004.
Warning: These citations may not always be 100% accurate.