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Saudiarabien : Insel der Araber
Kopf, Wilhelm, (1982)
Saudi Arabia : bibliography on society, politics, economics ; literature in West European languages with location references
Philipp, Hans-Jürgen,
The Saudi Arabian economy
Knauerhase, Ramon, (1975)
Sheba's daughters : being a Record of Travel in Southern Arabia : 47 plates, folding map, and Rock Pictures in the text
Philby, Harry St. J. B., (1939)
Arabia of the Wahhabis
Philby, Harry St. J. B., (1928)
Arabian oil ventures
Philby, Harry St. J. B., (1964)