Ashcraft, Mark H.
Harper Collins, 1994
Buku Teks
Stein, Donald G.
Macmillan, 1974
Buku Teks
Ashcraft, Mark H.
Pearson, 2014
Buku Teks
edited by Daniel Reisberg and Paula Hertel
Blackwell, 2006
Buku Teks
Parkin, Alan C.
John Wiley & Sons, 1999
Buku Teks