Hibberd, Jack, author
Currency Press, 1988
Buku Teks
Reich, Brian, author
Emerald, 2017
eBooks
Dimen-Schein, Muriel, author
McGraw-Hill, 1977
Buku Teks
Morton, Adam, author
Polity Press, 2013
Buku Teks
Cwikel, Julie G, author
Columbia University Press, 2006
Buku Teks