Jakob Andreas Baerentzen, author
Springer-Verlag, 2012
eBooks
Cortesi, David E.
Holt, Rinehart and Winston, 1982
Buku Referensi
Tunnicliffe, W.R., author
Prentice-Hall, 1991
Buku Teks
Zimmer, J. A., author
McGraw-Hill, 1985
Buku Teks
Travers, Kenneth J., author
Laidlaw Brothers, 1987
Buku Teks