Hurford, Daphne M
Scribner, 1998
Buku Teks
O`Connor, Edwin
An Atlantic Prees Book, 1964
Buku Teks
O`Connor, Edwin
Little, Brown, 1966
Buku Teks
Haywood, Roger, 1939-
McGraw-Hill , 1984
Buku Teks
Gerling, Heinrich
Wiley Eastern Limited, 1982
Buku Teks