edited by Frederick C. Allard
McGraw-Hill, 1990
Buku Referensi
edited by Helmut F. Wolf
Garland STPM Press, 1979
Buku Referensi
edited by Frederick C. Allard
McGraw-Hill, 1989
Buku Referensi
McCartney, Earl J., author
John Wiley & Sons, 1976
Buku Teks
edited by V. Lakshmikantham
Academic Press, 1979
Buku Teks