Robert Cummins
Blackwell Publishing, 2000
Buku Teks
Friedenberg, Jay, author
Sage, 2006
Buku Teks
Sun, Ron, author
Oxford University Press, 2016
eBooks
edited by William Bechtel and George Graham
Blackwell, 1999
Buku Teks
Solso, Robert L., 1933-, author
Allyn and Bacon, 2001
Buku Teks