Barnett, Stephen, author
Clarendon Press, 1990
Buku Teks
Halbeisen, Lorenz J., author
[Springer, ], 2012
eBooks
Chartrand, Gary
Prindle, Weber & Schmidt , 1977
Buku Teks
Levy, Leon S.
John Wiley & Sons, 1980
Buku Teks
Tremblay, Jean-Paul, 1938-, author
McGraw-Hill, 1975
Buku Teks