Leonard, William R. UN development aid : criteria and methods of evaluation / William R. Leonard, Béat Alexander Jenny & Offia Nwali - New York : Arno Press , 1971 - 135p. : ill. ; 24 cm. Includes bibliographical references. ISBN: 0405022352 Subjects--Corporate Names: United Nations--Technical assistance Dewey Class. No.: UN 338.93 / LEO