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