Gaya APA

Anggraeni, A, L., Maggs, M. (1983). Grolier Programmed English Course 1 (-). United States of America: Grolier International, Inc.

Gaya MLA

Anggraeni, Arinta, Lyra., Maggs, Margaret. "Grolier Programmed English Course 1". - United States of America: Grolier International, Inc, 1983. Text.