Hunningher, B
Amsterdam Noord Hollandse uitgevers 1956
Buku Teks
Smith, B.J., author
Longman, 1971
Buku Teks
Izenour, George C., author
McGraw-Hill, 1977
Buku Teks
Izenour, George C., author
Yale University Press, 1996
Buku Teks
Izenour, George C., author
McGraw-Hill, 1977
Buku Teks