Green, George S.
Holt, Rinehart and Winston, 1972
Buku Teks
Allen, W. Stannard, author
Longman, 1974
Buku Teks
Allen, W. Stannard, author
Longman, 1974
Buku Teks
V.S. Belevitskaya-Khalizeva ...[et al.]
Foreign Languages Publishing House, [date of publication not identified]
Buku Referensi
Heinemann Educational Books, 1981
Buku Teks