6 1 20 Hansen, Don R Additional Author Maryanne M. Additional Author mixed material 9796911981 Hansen, Don R Additional Author Maryanne M. Additional Author mixed material 9794117463 Maryanne M Mowen Primary Author Hansen, Don R Primary Author mixed material 9796910047 Hansen, Don R Additional Author Maryanne M. Additional Author mixed material 979691199X Maryanne M Mowen Primary Author Hansen, Don R Primary Author mixed material 9796910039 Maryanne M Mowen Additional Author Hansen, Don R Primary Author mixed material 9789812546746