Newman, Philip L.
Rinehart and Winston, 1965
Buku Teks
Newman, Philip L.
Holt, Rinehart and winston, 1965
Buku Teks
Dupee, F.W., author
Doubleday, 1956
Buku Teks
Swan, Michael, author
Longmans, 1950
Buku Teks
Swan, Michael, author
Longmans Green, 1969
Buku Teks