Grilly, David M., author
Pearson, 2012
Buku Teks
Grilly, David M. , author
Alan and Bacon, 1998
Buku Teks
McKim, William A., author
Prentice-Hall, 1991
Buku Teks
Roop, Robert S. de
St Martins Press, 1957
Buku Teks
Julien, Robert M., author
W H Freeman, 1975
Buku Teks