Author - Donald Hamilton: This site has a brief biography and synopses of all the Matt Helm novels and of some of Hamilton's other novels, as well.
Donald Hamilton: Biography, further reading, and selected bibliography.
Donald Hamilton by Robert Skinner: Biography and a lengthy overview of Hamilton's work.
Matt Maps: A collection of maps that trace the novelistic travels of Donald Hamilton's Matt Helm.
Secret Agent He-Man: A review of the Matt Helm series by Donald Hamilton.
The Donald Hamilton Worship Page: Donald Hamilton fan page containing news, reviews, and various tidbits about the author and his work.