Coleman, James C.
Scott, Foresman,, 1986
Buku Teks
by Ann M. Kring ... [et.al.]
Wiley, 2010
Buku Teks
Davison, Gerald C., author
John Wiley & Sons, 2004
Buku Teks
Carson, Robert C., author
Longman, 1997
Buku Teks
David Rosenhan, Perry London
Halt, Rinehart and Winston, 1969
Buku Teks