By A Mystery Man Writer
The 50th anniversary of the Victoria line extension to Brixton
London, Future of the Underground Network, Vision, Page 16
Underground Extension To Streatham - My Streatham
Proposal to extend the Northern line to Clapham Junction
How did London's Tube lines get their names? - City Monitor
London Underground: How Piccadilly Line station designs were used by illiterate passengers
Would a Victoria line extension into South London along with the Bakerloo line be beneficial? : r/LondonUnderground
London, Future of the Underground Network, Vision, Page 16
The 50th anniversary of the Victoria line extension to Brixton
London Underground - Wikipedia