Shier, Douglas R., author
Oxford University Press, 1991
Buku Teks
Ahsan, Javed, author
[Springer, ], 2012
eBooks
Crouch, Ralph, author
Scott, Foresman, 1966
Buku Teks
edited by L. Lovasz and Vera T. Sos
North-Holland Publishing, 1981
Buku Teks
Rich, Elaine, author
Pearson Prentice hall, 2009
Buku Teks