Collier, D. A., & Evans, J. R. (2015). OM (Fifth student edition.). Cengage Learning.
Chicago Style (17th ed.) CitationCollier, David A., and James R. Evans. OM. Fifth student edition. Boston, MA.: Cengage Learning, 2015.
MLA (9th ed.) CitationCollier, David A., and James R. Evans. OM. Fifth student edition. Cengage Learning, 2015.
Warning: These citations may not always be 100% accurate.