Christensen, Larry B., 1941- Experimental methodology / Larry B. Christensen. - 6th ed. - Boston : Allyn and Bacon, c1994. - xiv, 561 p. : ill. ; 25 cm. ISBN: 0205155065 LCCN: 93031421 LC Class. No.: BF181 .C48 1994 / .C48 1994 Dewey Class. No.: 150/.724