Παραπομπή APA

Humble, J. W. (1968). Improving business results (2nd ed.). McGraw-Hill.

Παραπομπή Chicago Style

Humble, John W. Improving Business Results. 2nd ed. Berkshire: McGraw-Hill, 1968.

Παραπομπή MLA

Humble, John W. Improving Business Results. 2nd ed. McGraw-Hill, 1968.