The Church-Turing Thesis - Article from the Stanford Encyclopedia.

Alan Mathison Turing - Undergraduate biographical essay by John M. Kowalik.

Alan Turing - Biography from the MacTutor History of Mathematics archive.

Turing Digital Archive - Digital archive of items relating to Alan Turing.

Alan Turing - Biographical entry in the FOLDOC.

Turing Machine - Article on Turing Machines from the Stanford Encyclopedia.

Alan Turing Archive - Archive and historical records pertaining to the work of computing pioneer Alan Turing.

On Computable Numbers with an Application to the Entscheidungsproblem - Turing's paper which discusses the halting problem in the context of Gödel's Incompleteness Theorem. HTML.

Wired Archive: Alan Turing - Stories involving Turing.

Alan Turing Papers - Collection record of Turings papers at Kings College, Cambridge.

Alan Turing: The Biography Project - Biography, bibliography and links.

Alan Turing and his Turing Machines - A site about the life of Alan Turing, and in particular an explanation of his Turing machines.