American men of science : a biographical directory
edited by The Jaques Cattell Press
R.R. Bowker, 1970
 Buku Referensi
American men of Science : a biographical directory
edited by The Jaques Cattell Press
R.R. Bowker, 1965, 1966, 1967
 Buku Referensi
Sage biographical research
Goodwin, John, editor
Sage , 2012
 Buku Teks
Lewes, George Henry, author
A Biographical History of Philosophy
Cambridge University Press, 2013
 eBooks
Directory of further education 1987/8
Hobsons Pub.,, 1987
 Buku Referensi
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