Alcock, John, author
Sinauer Associates, 1989
Buku Teks
edited by J.R. Krebs and N.B. Davies
Blackwell, 1995
Buku Teks
edited by Ronald I. Miller
Chapman & Hall, 1994
Buku Teks
Nybakken, James W. (James Willard), author
Benjamin Cummings, 2001
Buku Teks
Nybakken, James W. (James Willard), author
Harper Collins, 1993
Buku Teks