Gaya APA

JR, E, T, C. (1990). NEW ENGLISH COURSE BOOK 4 PART A 4 . U.S.A: ENGLISH LANGUAGE SERVICES.

Gaya MLA

JR, EDWIN, T., CORNELIUS,. "NEW ENGLISH COURSE BOOK 4 PART A 4". U.S.A: ENGLISH LANGUAGE SERVICES, 1990. Text.