Cordes, Kathleen A.
McGraw-Hill, 1999
Buku Teks
Curry, Nigel
E & FN Spon, 1994
Buku Teks
Fitzgerald, Gerald B.
A.S.Barnes and Company, 1948
Buku Teks
Butler, George D.
McGraw-Hill Book Company, Inc., 1949
Buku Teks
Bell, Simon
Taylor and Francis, 2008
Buku Teks