James M. Postma, California State University, Chico; Julian L. Roberts, Jr., University of Redlands; J. Leland Hollenberg, University of Redlands ©2011 | Seventh Edition ISBN-13: 9781429219549
James M. Postma; Julian Roberts Jr; Leland J. Hollenberg ©2010 | Seventh Edition ISBN-13: 9781429224307