VROOM V. H. &. Y. P. W., . (1973). LEADERSHIP & DECISION-MAKING. : UNIVERSITY OF PITTSBURGH PRESS.
VROOM V H & YETTON P W, . 1973. LEADERSHIP & DECISION-MAKING. : UNIVERSITY OF PITTSBURGH PRESS.
VROOM V H & YETTON P W, . LEADERSHIP & DECISION-MAKING. : UNIVERSITY OF PITTSBURGH PRESS. 1973.