Donaldson, Stewart I. What counts as credible evidence in applied research and evaluation practice ? / edited by Stewart I. Donaldson,Christina A. Christie and Melvin M. Mark. - / . - London : Sage Publications , 2009. - 265p. : figures ; 24cm . Includes index ISBN: 9781412957076 USD42.95 Subjects--Index Terms: RESEARCH AND EVALUATION Dewey Class. No.: 001.42 / DON/W