Hodgetts, Richard M.
John Wiley & Sons, 2002
Buku Teks
Lundy, James L.
Eurasia Publishing House, 1968
Buku Teks
Sanderson, Edward D.
Aspen Publishing, 1985
Buku Teks
Hodgetts, Richard M.
Harcourt College Publishers, 2001
Buku Teks
Dreger, J. Brian
Van Nostrand Reinhold, 1992
Buku Teks