Ewert, Alan W., 1949-, author.
CABI, 2014
Buku Teks
Greenwood, Ned H., author
Duxbury Press, 1979
Buku Teks
Bradford, Michael, author
Oxford University Press, 1994
Buku Teks
Seleebey, Dennis, author
Columbia University Press, 2001
Buku Teks
edited by, Erik Hollnagel
CRC Press, 2017
Buku Teks