Associated Equipment Company
"Regent" Omnibus Chassis at Charing Cross / The Regent Omnibus 
Manufacturer's 1929 booklet describing the Regent models launched in that year. Photographs throughout.
Volumes One & Two
Very fine history of the Routemaster, illustrated with photographs throughout, including colour. Published in two parts:
Volume One: 1954 - 1969;
Volume Two: 1970 - 1989.
BROWN, Stewart J.
Bus Monographs: 3
History and operation of the Routemaster, supported with photographs throughout. Published in the 1980s series of six on specific types under the title 'Bus Monographs' (search using this term for other titles).