Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (9ú heag.)

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

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