Adler, John H., author
Stanford University Press, 1951
Buku Teks
Zamir Iqbal and Abbas Mirakhor, Editors
The World Bank, 2013
Buku Teks
Swerdlow, Irving, author
Frederick A. Praeger, 1975
Buku Teks
Poole, Kenyon E.
N.Y. Rinehart , 1956
Buku Teks
Hanson, A.H.
London Routledge & Kegan Paul 1959,
Buku Teks