APA استشهاد

Bittel, L. R. (1978). Encyclopedia of professional management. McGraw-Hill.

استشهاد بنمط شيكاغو

Bittel, Lester Robert. Encyclopedia of Professional Management. New York: McGraw-Hill, 1978.

MLA استشهاد

Bittel, Lester Robert. Encyclopedia of Professional Management. McGraw-Hill, 1978.