Παραπομπή APA

Bittel, L. R. (1978). Encyclopaedia of professional management. Grolier.

Παραπομπή Chicago Style

Bittel, Lester Robert. Encyclopaedia of Professional Management. Connecticut: Grolier, 1978.

Παραπομπή MLA

Bittel, Lester Robert. Encyclopaedia of Professional Management. Grolier, 1978.