Twitchell, K.S., author
Saudi Arabia : with an account of the development of its natural resources
Princeton University, 1958
 Buku Teks SO
Twitchell, K.S., author
Saudi Arabia, with an account of the development of its natural resources
Princeton University Press, 1953
 Buku Teks SO
Twitcheil, K.S.
Saudi Arabia with an account of the development of its natural resources with the collaboration of and
New Jersey Princeton Univ. 1958
 Buku Teks
Natural resources and international development
edited by Marion Clawson
John Hopkins Press, 1965
 Buku Teks
Natural resources and development
Federal Republic of Germany, 1977
 Buku Teks
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