Bliven, Bruce
Henry Holt and Company, 1956
Buku Teks
Collier, Basil, author
William Marrow, 1965
Buku Teks
McCarty, Battle
John Wiley & Sons, 1999
Buku Teks
Snow, Edgar, author
The World Publishing, 1944
Buku Teks
Furneaux, Rupert
Stein and Day, 1971
Buku Teks