edited by The Jaques Cattell Press
R.R. Bowker, 1970
Buku Referensi
edited by The Jaques Cattell Press
R.R. Bowker, 1965, 1966, 1967
Buku Referensi
Goodwin, John, editor
Sage , 2012
Buku Teks
Lewes, George Henry, author
Cambridge University Press, 2013
eBooks
Hobsons Pub.,, 1987
Buku Referensi