Gaya APA

Kaufman, E, C, A, W. (1978). English Commercial Practice and Correspondence A First Course for Foreign Students (Third Edition). Yogyakarta: Penerbit Yayasan Kanisius.

Gaya MLA

Kaufman, Eckersley, CE, And, W. "English Commercial Practice and Correspondence A First Course for Foreign Students". Third Edition Yogyakarta: Penerbit Yayasan Kanisius, 1978. Text.