Guth, Hans P., author
Belmott,
Buku Teks
edited by Leonard F. Dean
Harcourt, Brace, 1951
Buku Teks
Galbraith, John Kenneth, 1908-2006, author
British Broadcasting Corporation, 1977
Buku Teks
Klir, George J., author
John Wiley & Sons, 2006
Buku Teks
Lipsey, Richard G., 1928-, author
Harper Collin, 1996
Buku Teks