Cleveland, William L., author
Westview Press , 2004
Buku Teks
Ochsenwald, William, author
McGraw-Hill, 2011
Buku Teks
Sloan, A
Hutchinson , 1924
Buku Teks
Lenczowski, George, author
Cornell University Press, 1956
Buku Teks
Bullard, Reader
Oxford university Press, 1958
Buku Teks