^Badsey-Ellis، Antony (2005). London's Lost Tube Schemes. Capital Transport. ص. 70–71. ISBN:1-85414-293-3.
^Badsey-Ellis، Antony (2005). London's Lost Tube Schemes. Capital Transport. ص. 220. ISBN:1-85414-293-3.
^Connor، Piers (1993). "The District Looks West". Going Green: The Story of the District line. Harrow Weald: Capital Transport. ص. 14, 16. ISBN:1-85414-157-0.
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