Panchen, Alec L., author
Cambridge University Press, 1994
Buku Teks
Starr, Cecie, author
Thomson, 2004
Buku Teks
Kelly, Mahlon G., author
Houghton Miffiln, 1975
Buku Teks
Chaisson, Eric., author
Harvard University Press, 2001
Buku Teks
Mader, Sylvia S., author
Wm. C. Brown Publisher, 1993
Buku Teks