American men of science : a biographical directory
edited by The Jaques Cattell Press
R.R. Bowker, 1970
 Buku Referensi
Directory of further education 1987/8
Hobsons Pub.,, 1987
 Buku Referensi
Sage biographical research
Goodwin, John, editor
Sage , 2012
 Buku Teks
Lewes, George Henry
A Biographical History of Philosophy
Cambridge University Press, 2013
 eBooks
The Education authorities directory and annual 1987
School Government Publishing Co., 1987
 Buku Referensi