Herrmann, Paul
Harper & Brothers , 1956
Buku Teks
Lamb, Harold, author
Doubleday, 1955
Buku Teks
Goetzmann, William H.
Viking, 1986
Buku Teks
Arnold, David, author
Routledge, 1994
Buku Teks
Brosse, Jacques, author
Facts on File Publications, 1983
Buku Referensi