Gaya APA

Kaczmarek, K, O, L, S, K. (2011). Business communication building critical skills (5th. ed.). New York: Mc. Gravo Hill.

Gaya MLA

Kaczmarek, Kitty, O., Locker;, Stephen, Kyo. "Business communication building critical skills". 5th. ed. New York: Mc. Gravo Hill, 2011. Text.