Simmonds, J.D., author
Columbia University Press, 1970
Buku Teks
Marcy Rockman, Joe Flatman, editor
[Springer, Springer], 2012
eBooks
Dobbs-Higginson, Michael S., author
Longman, 1993
Buku Teks
Arlington House Publisher, 1979
Buku Teks
Carter, Thomas Francis, author
Ronald Press, 1925
Buku Teks