Rutherford, Brian A., author
Sage Publications India Pvt Ltd, 2000
Buku Teks
Bellandi, Francesco, author
Emerald, 2018
eBooks
Brownlee, E. Richard, author
Irwin, 1998
Buku Teks
Jarett, Irwin M., author
John Wiley & Sons, 1983
Buku Teks
Alexander, David, author
Chapman & Hall, 1991
Buku Teks