Παραπομπή APA

Ryan, W. (1967). Business horizons. G.S.B.A. Indian university.

Παραπομπή Chicago Style

Ryan, W.G. Business Horizons. Bloomington: G.S.B.A. Indian university, 1967.

Παραπομπή MLA

Ryan, W.G. Business Horizons. G.S.B.A. Indian university, 1967.