McVey, Ruth Thomas, author
Cornell university, 1962, 1957.
Buku Teks
Shteppa, Konstantin F., author
Rutgers University Press, 1962
Buku Teks
edited by R.R. Milner-Gulland
Pergamon Press, 1964
Buku Teks
Harvard University Press, 1955
Buku Teks
Dallin, David J., author
Yale University Press, 1942
Buku Teks