Starr, Cecie
Thomson, 2004
Buku Teks
Kelly, Mahlon G.
Houghton Miffiln, 1975
Buku Teks
Chaisson, Eric.
Harvard University Press, 2001
Buku Teks
Mader, Sylvia S.
Wm. C. Brown Publisher, 1993
Buku Teks
Volpe, E. Peter (Erminio Peter)
W.C. Brown, 1975
Buku Teks