Fairchild, Fred Rogers, author
Macmillan, 1939
Buku Teks
Nordin, J.A., author
Prentice-Hall, 1954
Buku Teks
Fairchild, Fred Rogers, author
Macmillan, 1989
Buku Teks
McConnell, Campbell R., author
McGraw-Hill, 1966
Buku Teks
Lipsey, Richard G., 1928-, author
Harper Collin, 1996
Buku Teks