Galbraith, John Kenneth, 1908-2006, author
Houghton Mifflin, 1964
Buku Teks
edited by Richard A. Easterlin
University of Chicago Press, 1980
Buku Teks
Habakkuk, H.J.
Leicester University Press, 1972
Buku Teks
edited by John F. Kantner, Lee McCaffrey
Lexington Books, 1975
Buku Referensi
Fik, Timothy J.
McGraw-Hill , 2000
Buku Teks