edited Ruth Pitchford and Adam Cox
Kogan Page, 1997
Buku Teks
Artikel Jurnal
Rousseas, Stephen, author
Alfred A. Knopf, 1972
Buku Teks
edited by R.W. Clower
Pergamon Press, 1969
Buku Teks
Hansen, Alvin Harvey, 1887-1975, author
Amacom, 1977
Buku Teks