Pauli, Gunter
Epsilon Press, 1996
Buku Teks
edited by Ann Mattis
Duke University Press in collaboration with the Society for International Development, 1983
Buku Teks
Baumol, William J.
Macmillan, 1959
Buku Klasik
Lewis, William Arthur, 1915-
George Allen & Unwin, 1951
Buku Teks
Kunkel, John H.
Oxford University Press, 1970
Buku Teks