Guerard, ALbert
Alfred A. Knopf, 1956
Buku Teks
Gershoy, Leo, author
Appleton Century Crofts, 1938
Buku Teks
Albrecht-Carrie, Rene, author
Columbia University Press, 1950
Buku Teks
Brogan, D.W. (Denis William), author
Harper & Brothers, 1957
Buku Teks
Price, Roger, author
Routledge, 1997
Buku Teks