Siegel, Carl Ludwig, 1896-, author
John Wiley & Sons, 1973
Buku Teks
Spiegel, Murray R., author
McGraw-Hill, 1981
Buku Teks
University of Notre Dame, 1992
Buku Teks
Besov, Oleg V.
V. H. Winston & Sons , 1978 dan 1979
Buku Teks
Wunsch, A. David
Addison-Wesley Pub.Co., 1994
Buku Teks