Lial, Margaret L., author
Addison-Wesley, 2005
Buku Teks
W.D Wallis
[Springer Science, ], 2012
eBooks
Armstrong, James W., author
Macmillan, 1976
Buku Teks
Drooyan, Irving, author
Wadsworth, 1971
Buku Teks
Meserve, Bruce B., author
Prentice-Hall, 1972
Buku Teks