Allen L. Hammond [and others]
Oxford University Press , 1996
Buku Teks
Cleaver, Tony
Routledge, 1997
Buku Teks
Mansbach, Richard W.
Houghton Miffiln, 2000
Buku Teks SO
Payne, Richard J., 1949-
Pearson Education , 2014
Buku Teks
edited by Gordon Greenwood and Norman Harper
F.W. Cheshire, 1957
Buku Teks