Gaya APA

Spooner, M., kalen,J.S, M. (1977). Commercial Correspondence in English (Cet. 2). Southamton: The Camelot Preess.

Gaya MLA

Spooner, M.D.., kalen,J.S, Mc. "Commercial Correspondence in English". Cet. 2 Southamton: The Camelot Preess, 1977. Buku.