Frank, Helmut J., author
Frederick A. Praeger, 1966
Buku Teks
editor, Avraham Sela
Continuum, 2002
Buku Referensi
S l. Exxon Corporation 1980,
Buku Teks
Morrison, Stanley Andrew, author
SCM Press, 1954
Buku Teks
Abboushi, W.F., 1931-, author
Dodd, Mead, 1971
Buku Teks