Harrel, W. (1997). Coreldraw 7: Secrets. Comdex.
Lua i Stíl Chicago (17ú heag.)Harrel, William. Coreldraw 7: Secrets. New delhi: Comdex, 1997.
Lua MLA (9ú heag.)Harrel, William. Coreldraw 7: Secrets. Comdex, 1997.
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