Millar, T.B.
Sydney University Press, 1967
Buku Teks
Stewart, Robert B., author
Macmillan, 1939
Buku Teks
Gooch, R.K.
Appleton-Century, 1935
Buku Teks
Sturgis,Alice F
McGraw-Hill Book Company,INC, 1953
Buku Teks
Patrick Malcolmson, Richard Myers, Gerald Baier, and Thomas M.J. Bateman.
Canada University of Toronto Press , 2016
Buku Teks