Gaya APA

INC, E, L, S. (1980). A BASIC COURSE SIX ENGLISH 900 (VOL 9). NEW YORK: CASSEL & COLLIER MACMILLAN PUBLISHER LIMITED.

Gaya MLA

INC, ENGLISH, LANGUE, SERVICE,. "A BASIC COURSE SIX ENGLISH 900". VOL 9 NEW YORK: CASSEL & COLLIER MACMILLAN PUBLISHER LIMITED, 1980. Text.