APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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