Weil, Andre
Springer-Verlag , 1973
Buku Teks
Adams, William W., author
Prentice-Hall, 1976
Buku Teks
Flath, Daniel E., author
John Wiley & Sons, 1989
Buku Teks
edited by L. Lovasz and Vera T. Sos
North-Holland Publishing, 1981
Buku Teks
Rosenberg, Jonathan
Springer, 1944
Buku Teks