Gaya APA

Kench,A.B, . (1977). The Language of English Business Letters: Commercial Correspondence For Foreign Students Of English (Cet.1). London: Macmillan Publishing Co.Inc.

Gaya MLA

Kench,A.B, . "The Language of English Business Letters: Commercial Correspondence For Foreign Students Of English". Cet.1 London: Macmillan Publishing Co.Inc, 1977. .