edited by J. Richard Jennings, Michael G.H. Coles
John Wiley & Sons, 1991
Buku Referensi
Bloom, Floyd E.
W.H. Freeman & Co. , 1988
Buku Teks
Knoblauch, Kenneth
Springer, 2012
eBooks
Sinauer Associates, 2004
Buku Teks
edited by R. G. M. Morris
Clarendon Press, 1989
Buku Referensi