Mund, Vernon A., author
Appleton-Century-Crofts, 1971
Buku Teks
Allen, Louis A., author
McGraw-Hill, 1958
Buku Teks
Lundy, James L., author
Eurasia Publishing House, 1968
Buku Teks
Batty, J
The English Languange Book Society, 1979
Buku Teks
Batty, J
The English Languange Book Society, 1979
Buku Teks