Bullard, Reader
Oxford university Press, 1958
Buku Teks
edited by Shireen Hunter ; foreword by Robert G. Neumann and G. Henry M. Schuler
Westview Press, 1985
Buku Teks
Frank, Helmut J.
Frederick A. Praeger, 1966
Buku Teks
S l. Exxon Corporation 1980,
Buku Teks
editor, Avraham Sela
Continuum, 2002
Buku Referensi