The Pooh Perplex was first written over 45 years ago, but a few years ago the University of Chicago Press put out a new edition, which contains a new preface by the author.
Mark Dever explains the basic idea in an annotated bibliography on inerrancy:

[A book] not written by an evangelical Christian, but which has proved to be good medicine when first encountering various literary criticisms is Frederick C. Crews, The Pooh Perplex (E. P. Dutton, 1965). In this book, Crews carefully, sarcastically, and humorously “proves” that the Winnie the Pooh stories actually have multiple authors. There could hardly be a more enjoyable send-up and devastating critique of many kinds of literary criticism, not to mention an expose of the arbitrariness of any such studies’ “assured results.”

The full subtitle is: In Which It is Discovered that the True Meaning of the Pooh Stories is Not as Simple as is Usually Believed, but for Proper Elucidation Requires the Combined Efforts of Several Academicians of Varying Critical Persuasions.

Professor Crews’s sequel is Postmodern Pooh.

Update: See also this essay: “New Directions in Pooh Studies: Überlieferungs- und religionsgeschichtliche Studien zum Pu-Buch.”