 Encyclopedia of evaluation by Sandra Mathison; eBook : DocumentLanguage: EnglishPublisher: Thousand Oaks, Calif. : Sage, 2005.Database: WorldCatEncyclopedia of social theory by George Ritzer; Sage Publications.; eBook : DocumentLanguage: EnglishPublisher: Thousand Oaks, CA : Sage Publications, 2005.Database: WorldCatEncyclopedia of political communication by Lynda Lee Kaid; Christina Holtz-Bacha; Sage Publications.; eBook : DocumentLanguage: EnglishPublisher: Los Angeles : Sage Publications, 2008.Database: WorldCat 