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Ḥaḍramaut : Bevölkerung und Wirtschaft im Wandel der Gegenwart
Leidlmair, Adolf, (1961)
Die Aden-Grenze in der Südarabienfrage : 1900 - 1967
Plass, Jens Barthold, (1967)
Report by Mr. Roderic Bowen, Q. C., on procedures for the arrest, interrogation and detention of suspected terrorists in Aden : 14 November, 1966
Bowen, Roderic, (1966)
Report on the finances of Aden Colony
Tress, R. C., (1960)