Gaya APA

Kench, A. (1972). The Language Of English Busines Letters : Commercial Correspondence For Foreign Student Of English (Cet 2). london: Macmilan Education Limited.

Gaya MLA

Kench, A.B. "The Language Of English Busines Letters : Commercial Correspondence For Foreign Student Of English". Cet 2 london: Macmilan Education Limited, 1972. Text.