[publisher not identified], [date of publication not identified]
Naskah
Snyder, Louis L., author
Van Nostrand Company, 1958
Buku Teks
Romula, Carlos P.
W. Van Hoeve, 1954
Buku Teks
edited by Brigadier Peter Young
Hamlyn, 1981
Buku Referensi
Gammage, Bill, editor
Penguin Books, 1975
Buku Teks