Hogan, Patrick Colm, author
Routledge, 2005
Buku Teks
edited by William Bechtel and George Graham
Blackwell, 1999
Buku Teks
Gallistel, C. R., author
Wiely-Blackwell, 2009
Buku Teks
Friedenberg, Jay, author
Sage, 2006
Buku Teks
Robert Cummins
Blackwell Publishing, 2000
Buku Teks