Cormac McCarthy told an interviewer for the New York Times Magazine that “books are made out of books,” but he has been famously unwilling to discuss how his own writing draws on the works of other writers. Yet his novels and plays masterfully appropriate and allude to an extensive range of literary works, demonstrating that McCarthy is well aware of literary tradition, respectful of the canon, and deliberately situating himself in a knowing relationship to precursors. The Wittliff Collection at Texas State University acquired McCarthy’s literary archive in 2007. In Books Are Made Out of Books, Michael Lynn Crews thoroughly mines the archive to identify nearly 150 writers and thinkers that McCarthy himself references in early drafts, marginalia, notes, and correspondence. Crews organizes the references into chapters devoted to McCarthy’s published works, the unpublished screenplay Whales and Men, and McCarthy’s correspondence. For each work, Crews identifies the authors, artists, or other cultural figures that McCarthy references; gives the source of the reference in McCarthy’s papers; provides context for the reference as it appears in the archives; and explains the significance of the reference to the novel or play that McCarthy was working on. This groundbreaking exploration of McCarthy’s literary influences—impossible to undertake before the opening of the archive—vastly expands our understanding of how one of America’s foremost authors has engaged with the ideas, images, metaphors, and language of other thinkers and made them his own.