Gaya APA

Penelope, B., C., L, S. (1987). Politeness: Some Universals In Language Usage (C. 2). New York: Cambridge University Press.

Gaya MLA

Penelope, Brawn., C., Levinson, Stephen. "Politeness: Some Universals In Language Usage". C. 2 New York: Cambridge University Press, 1987. Text.