Saff, E. B.
Prentice-Hall, 1976
Buku Teks
Fischer, Wolfgang
[, Vieweg+Teubner Verlag], 2012
eBooks
Henrici, Peter
John Wiley & Sons, 1986
Buku Teks
Zill, Dennis G.
Jones & Bartlett Learning, 2009
Buku Teks
Churchill, Ruel V., 1899-1987
McGraw-Hill, 1984
Buku Teks