APA (7th ed.) Citation

Callis, S. (1994). Effective writing for business. Buckingham Tutors Pub.

Chicago Style (17th ed.) Citation

Callis, Sidney. Effective Writing for Business. Buckingham, Bucks, U.K: Buckingham Tutors Pub, 1994.

MLA (9th ed.) Citation

Callis, Sidney. Effective Writing for Business. Buckingham Tutors Pub, 1994.