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