Clapham, Ronald, author
LP3ES, 1991
Buku Teks
Green, Charles H., author
McGraw-Hill , 2012
Buku Teks
Beckerling, Louis
Euromoney Publications, 1996
Buku Teks
Priestley, J. B. (John Boynton), 1894-1984, author
J.M. Dent and Sons, 1953
Buku Teks
Bobrick, Benson
Penguin Books, 1997
Buku Teks