Albrecht-Carrie, Rene, author
Columbia University Press, 1950
Buku Teks
Brogan, D.W. (Denis William), author
Harper & Brothers, 1957
Buku Teks
Brogan, D.W. (Denis William), author
Arrow Book, 1961
Buku Teks
Durant, Will, author
Simon and Schuster, 1953
Buku Teks
[publisher not identified], [date of publication not identified]
Naskah