Cita APA (7th ed.)

GARTSIDE, L. (1989). Modern business correspondence.-- ed.4. Binarupa Aksara.

Cita Chicago (17th ed.)

GARTSIDE, L. Modern Business Correspondence.-- Ed.4. Jakarta: Binarupa Aksara, 1989.

Cita MLA (9th ed.)

GARTSIDE, L. Modern Business Correspondence.-- Ed.4. Binarupa Aksara, 1989.