^Hardy، Brian، المحرر (مارس 2011). "How it used to be - freight on The Underground 50 years ago". Underground News. London Underground Railway Society ع. 591: 175–183. ISSN:0306-8617.
^Kay، Peter (2006). Essex Railway Heritage. Wivenhoe UK: Peter Kay. ص. 28–29. ISBN:978 1 899890 40 8.