edited by Amitai Etzioni and Eva Etzi
Basic Books, 1964
Buku Teks
Cambridge University Press, 2010
eBooks
Allen L. Hammond [and others]
Oxford University Press , 1996
Buku Teks
Henslin, James M.
Erlangga, 2007
Buku Teks
Kendall, Diana
Thomson/Wadsworth, 2008
Buku Teks