Gaya APA

Brieger, N., Comfort, J. (1991). Language Fererence For Business Engllish : Grammar, Function, and Comunication Skills . United Kingdom: Prentice Hall International.

Gaya MLA

Brieger, Nick., Comfort, Jeremy. "Language Fererence For Business Engllish : Grammar, Function, and Comunication Skills". United Kingdom: Prentice Hall International, 1991. Text.