Blackburn, William H.
W.C. Brown Publishers, 1988
Buku Referensi
edited ny Keith Friye
Hutchinson Ross, 1981
Buku Referensi
Mason, Brian
W.H. Freeman, 1968
Buku Teks
Dana, Edward Salisbury
John Wiley & Sons, 1972
Buku Teks
Nesse, William D.
Oxford University Press, 2009
Buku Teks