Gaya APA

Bittel, L, R., Ramsey, J, E. (1998). Encyclopedia of professional management (Cetakan Pertama). United States Oof America: Grolier International.

Gaya MLA

Bittel, Lester, Robert., Ramsey, Jackson, Eugene. "Encyclopedia of professional management". Cetakan Pertama United States Oof America: Grolier International, 1998. Text.