||Cook, Michael L. Murder by Mail. Inside the Mystery Book Clubs. Bowling Green University Popular Press, 1983.
||The standard source for detailed information on all the detective book clubs. Covers the Detective Book Club though October 1983 (which is why publication month is available only though October 1983; after that year of publication is inferred by the books included in a each volume. Popular Press now seems to be distributed by the University of Wisconsin Press; Murder by Mail is no longer listed in print. There was an earlier edition in 1979.