David J. Howe, Mark Stammers, Stephen James Walker Doctor Who Handbook: The Fourth Doctor 1992 Dr Who Handbooks
ISBN0426203690
David J. Howe, Mark Stammers, Stephen James Walker Doctor Who - The Handbook: The First Doctor: The William Hartnell Years 1963 - 1966 (1993) Dr Who Handbooks
ISBN0426204301
Haining, Peter Doctor Who: 25 Glorious Years (1988)
ISBN1852270217
Haining, Peter Doctor Who: The Key to Time A year by year record (1984) (
ISBN0-491-03283-8)
Useful reference websites
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