Alexandrova, Vera
New York Doubleday 1963
Buku Teks
Huzzar, George B, De
Thomas Y.Crowell Company, 1955
Buku Teks
Hazard, John N., author
THe University of Chicago press, 1964
Buku Teks
Ulam, Adam B.
Harvard University Press, 1963
Buku Teks
Garder, Michel
Frederick A. Praeger, 1966
Buku Teks