3 1 50 Stephen Smith Primary Author mixed material 9780415259866 New York Routledge 2003 Stephen C. Smith Primary Author TODARO, Michael P. Primary Author mixed material 9780273655497 Harlow,England Pearson-Addison Wesley 2003 Smith, Robert L. Primary Author Herman, Stephen L. Additional Author mixed material 9781418063986 Delmar Cencage Learning Australia, Canada, Mexico, Singapore, Spain, United Kingdom, United States 2008