Damodaran, Aswath, author
John Wiley & Sons, 2012
Buku Teks
Brzezinski, Zbigniev K., author
Frederick A. Praeger, 1962
Buku Teks
Culver, John H.
Macmillan Publishing Company,
Buku Teks
Neustadt, Richard E., author
John Wiley & Sons, 1961
Buku Teks
edited by David S.G. Goodman and Gerald Segal
Routledge, 1994
Buku Teks