APA (7e ed.) Bronvermelding

Geffner, A. B. (1998). Barron's ESL guide to American business English. Barron's Educational Series.

Chicago (17e ed.) Bronvermelding

Geffner, Andrea B. Barron's ESL Guide to American Business English. Hauppauge, N.Y: Barron's Educational Series, 1998.

MLA (9e ed.) Bronvermelding

Geffner, Andrea B. Barron's ESL Guide to American Business English. Barron's Educational Series, 1998.