Kephart, William M. Extraordinary groups : the sociology of unconventional life-styles / William M. Kephart. - 2nd ed. - New York : St. Martin's Press, c1982. - viii, 325 p. ; 24 cm. ISBN: 0312278616 0312278624 (pbk) LCCN: 81051860 LC Class. No.: HX654 .K44 1982 / .K44 1982 Dewey Class. No.: 306/.1/0973