Hume, G. (1997). Manual of commercial correspondance. A.H.Wheeler.
Lua i Stíl Chicago (17ú heag.)Hume, G. Manual of Commercial Correspondance. New Delhi: A.H.Wheeler, 1997.
Lua MLA (9ú heag.)Hume, G. Manual of Commercial Correspondance. A.H.Wheeler, 1997.
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