Hertslet's Commercial Treaties 19. Auflage Seite 90
Hinchcliffe, Peter; Ducker, John T. and Holt, Maria (2007) Without glory in Arabia: the British retreat from Aden Tauris, London, page 89, ISBN 978-1-84511-140-3
Hinchcliffe, Peter; Ducker, John T. and Holt, Maria (2007) Without glory in Arabia: the British retreat from Aden Tauris, London, Seiten 89-91, 161, 168, ISBN 978-1-84511-140-3
