Thelen, Herbert Arnold, 1913- Dynamics of groups at work / [electronic resource] / by Herbert A. Thelen.. — Chicago : : University of Chicago Press,, [1963, c1954]. — ix, 374 p. ; 21 cm. Includes index. "First Phoenix ed., 1963." Bibliography: p. 367-368. Nat. Bib. No.: GB63-10861 Subjects--Topical Terms: Social group work. LC Class. No.: HV45 / .T47 1963 Dewey Class. No.: 301.1