Burnheim, John
University of California Press, 1985
Buku Teks
Caprara, Gian Vittorio, author
Oxford University Press, 2016
eBooks
Woll, Peter, author
Little, Brown, 1982
Buku Teks
Irish, Marian D., author
Prentice-Hall, 1962
Buku Teks
edited by William F. Fisher and Thomas Ponniah, 1966-
Zed Books, 2015
Buku Teks