 railways in the BR era, 1948–95. Vol. 1. Kettering: Silver Link. ISBN 1-85794-115-2. OCLC 43541211.Leboff, David; Demuth, Tim (1999). No Need to Ask!. Harrow Weald: Capital Transport. ISBN 1-85414-215-1.Mitchell, Vic; Smith, Keith (2006). Baker Street to Uxbridge & Stanmore. Midhurst: Middleton Press. ISBN 1-904474-90-X. OCLC 171110119.Mitchell, Vic; Smith, Keith (2005). Marylebone to Rickmansworth. Midhurst: Middleton Press. ISBN 1-904474-49-7. OCLC 64118587.Mitchell, Vic; Smith, Keith (2005). Rickmansworth to Aylesbury. Midhurst: Middleton Press. ISBN 1-904474-61-6.Simpson, Bill (2003). A History of the Metropolitan Railway. Vol. 1. Witney: Lamplight Publications. ISBN 1-899246-07-X.Simpson, Bill (2004). A History of the Metropolitan Railway. Vol. 2. Witney: Lamplight Publications. ISBN 1-899246-08-8.Wolmar, Christian (2004). The Subterranean Railway. London: Atlantic. ISBN 1-84354-023-1.ක්ෂේත්‍ර ගැඹුර ක්‍රමය යොදා ගනිමින් විශාලනය කරන ලද ඡායාරූපයක්ප්‍රකාශ විද්‍යාවේ දී (ව