APA استشهاد

Bull, G. (1977). Directors Hand Book (2nd ed.). McGraw-Hill.

استشهاد بنمط شيكاغو

Bull, George. Directors Hand Book. 2nd ed. Toronto: McGraw-Hill, 1977.

MLA استشهاد

Bull, George. Directors Hand Book. 2nd ed. McGraw-Hill, 1977.