Gaya APA

Bittel, L, R., Ramsey, J, E. (1985). Encyclopedia of professional management: volume 1 (Cetakan Kedua). United States Oof America: Grolier International.

Gaya MLA

Bittel, Lester, Robert., Ramsey, Jackson, Eugene. "Encyclopedia of professional management: volume 1". Cetakan Kedua United States Oof America: Grolier International, 1985. Text.