Moorehead, Alan, author
Harper and Brother, 1958
Buku Teks
Freund, H. A.
1945, Angus and Robertson
Buku Teks
Hosking, Geoffrey A., author
Penguin Book, 2001
Buku Teks
Fainsod, Merle, author
Harvard University Press, 1965
Buku Teks
Foreign languages publishing house, 1957
Buku Teks