Organisation for Economic Co-operation and Development, 1955
Buku Teks
Galston, Arthur W., author
Prentice-Hall, 1968
Buku Teks
Smith, C. Michael, author
Springer, 2005
Buku Teks
Agrios, George N., author
Academic Press, 1988
Buku Teks
Yasseen, Leonard C., author
New York, NY, American Research Council
Buku Teks