Kelley, Larry D., author
M.E. Sharpe, 2011
Buku Teks
Perrin, Karen M., author
Jones & Bartlett Learning, 2016
Buku Teks
Bobby J. Calder, editor
John Wiley & Sons, 2008
Buku Teks
Hancock, Alan, 1965-, author
Longman, 1977
Buku Teks
Sarup Sons, 2000
Buku Teks