Bales, Robert Freed SYMLOG a system for the multiple level observation of groups Robert F. Bales and Stephen P. Cohen, with the assistance of Stephen A. Williamson. - New York Free Press c1979. - xvii, 537 p. ill. 25 cm. Includes indexes. Bibliography: p. 511-521. ISBN: 0029013003 LCCN: 79007480 Subjects--Topical Terms: SYMLOG system.Small groups LC Class. No.: HM133 / .B343 1979 Dewey Class. No.: 301.18/5