In the Revised Crime Fiction IV, Raymond Chandler, Dashiell Hammett and Erle Stanley Gardner are denoted as series characters in a series of three novels by author William F. Nolan:

      The Black Mask Murders. St. Martin’s, 1994.

WILLIAM F. NOLAN The Black Mask Boys

      The Marble Orchard. St. Martin’s, 1996.
      Sharks Never Sleep. St. Martin’s, 1998.

    None of the above are given credit as fictional characters in other detective novels. Hammett and Chandler both appeared in Chandler, by William Denbow, for example; and obviously Hammett appeared in Joe Gores’ Hammett.

    Question: Are there other novels, ones I’m not thinking of, in which any of the above (including Gardner) appeared as fictional characters?

    And as long as I’m asking, what other real life mystery writers may have shown up as characters in novels written by someone else? Josephine Tey, I know, in a couple of novels by Nicola Upson, but since they were published after 2000, they’re beyond the scope of CFIV. Disregarding the date, are there others?