Åke Bertenstam (formerly Åke Jönsson) is a Swedish librarian at The Carolina Library of Uppsala University. He has compiled one of the largest bibliographies of works by and about J.R.R. Tolkien, originally published through various issues of Arda, and also found on the web site of Forodrim.
 Bibliography, selected
Noted by the users of Tolkien Gateway.
- Corrigenda to A Chronological Bibliography of the Writings of J.R.R. Tolkien
- 90 Cardiff: University of Wales Press
- Corrigenda to A Chronological Bibliography of Books About J.R.R. Tolkien
- 32 "Spojrzenie z zewnątrz"
- 40 Shadows of Heaven: Religion and Fantasy in the Writing of C.S. Lewis, Charles Williams, and J.R.R. Tolkien
- 57 [Bertenstam should perhaps have made a note on another book with the same title, published in 1990 by Green and Hooper, which also contains material on Tolkien. The latter book also lacks an entry in Bertenstam's compilation for 1990.]
- 71 [Erroneously placed under the heading 1974 (should be 1975)]
- 81 J.R.R. Tolkien: Architect of Middle Earth: A Biography
- 94 [The title The Lord of the Rings and The Hobbit: Notes should perhaps rather be Cliffs Notes on Tolkien's The Lord of the Rings and The Hobbit, or Tolkien's The Lord of the Rings and The Hobbit.]
- 128 Based on Petty's Ph. D. Thesis
- 147 Crabbe, Katharyn F.
- 282 Crabbe, Katharyn W.
- 312 A Tolkien Thesaurus
- 327 A Gyűrűk Ura
- A Chronological Bibliography of the Writings of J.R.R. Tolkien
- A Chronological Bibliography of Books About J.R.R. Tolkien
- Additions and Changes to "A Chronological Bibliography of Books About Tolkien"