APA استشهاد

Biswal, D., & Rao,J.K. (1980). Commercial correspondence (3rd rev. ed.). Kalyani.

استشهاد بنمط شيكاغو

Biswal, D., و Rao,J.K. Commercial Correspondence. 3rd rev. ed. Ludhiana: Kalyani, 1980.

MLA استشهاد

Biswal, D., و Rao,J.K. Commercial Correspondence. 3rd rev. ed. Kalyani, 1980.