Venkatsan, S., author
Sage, 2004
Buku Teks
Howlin, Patricia, author
John Wiley & Sons, 1999
Buku Referensi
edited by John P. Holdren, Eric Donald Hirsch
Delta Pub., 1996
Buku Teks
Carlsen, G. Robert
Harper & Row, 1971
Buku Referensi
Longmans, 1966/1967
Buku Teks