Gaya APA

Brieger, N., comfort, J. (1989). Early Business Contacs : Materials for developing listening and speaking skills for the student of business english . : Prentice Hall International.

Gaya MLA

Brieger, Nick., comfort, Jeremy. "Early Business Contacs : Materials for developing listening and speaking skills for the student of business english". : Prentice Hall International, 1989. Text.