Παραπομπή APA

Urwick, L. (1958). Leadership in the twentieth century. Sir Isaac Pitman.

Παραπομπή Chicago Style

Urwick, L.F. Leadership in the Twentieth Century. London: Sir Isaac Pitman, 1958.

Παραπομπή MLA

Urwick, L.F. Leadership in the Twentieth Century. Sir Isaac Pitman, 1958.