Fogg, G. E. (Gordon Elliott), 1919-, author
Cambridge Universitry Press, 1992
Buku Teks
edited by W.F. Bynum, E.J. Browne, Roy Porter
Macmillan Reference Books, 1989
Buku Referensi
Taylor, F. Sherwood, author
Frederick A. Praeger, , 1955
Buku Teks
edited by R.C. Olby, G.N. Cantor, J.R.R. Christie and M.J.S. Hodge
Routledge, 1990
Buku Referensi
Waugh, Linda R.
Peter de Ridder Press , 1976
Buku Teks