Barbash, Jack, author
John Hopkins Press, 1972
Buku Teks
Adams, Mikaela M., author
Oxford University Press, 2016
eBooks
Dunlop, John T.
Augustus M. Kelley, 1966
Buku Teks
Mortimer, J.E.
Oxford University Press , 1971
Buku Teks
edited by P.W.D. Matthews and G.W. Ford
Sun Books, 1968
Buku Teks