1. The Case of the Missing Bluebirds (Nick Anderson/N.I. Series, Scholastic, 2003)
  2. The Case of the Sneaky Stinger (Nick Anderson/N.I. Series, Scholastic, 2003)
  3. The Castle of Kukulcan (final book in the Serpent Passage Trilogy)
  4. The Charmed Fable: Mousey and the Golden Book
  5. The Chicken Little Agenda: Debunking Expert's Lies (Pelican Publishing, 2006)
  6. The Christmas Needle (CreateSpace, 2017)
  7. The Class with the Summer Birthdays (Henry Holt & Co., 1991)
  8. The Clone's Mother (Smashwords Edition, 2016)
  9. The Cold War of Kitty Pentecost (Swallow Press, 1979)
  10. The Colorado Coal Field War: Massacre at Ludlow (with Lisa Greenleaf, Apprentic…
  11. The Colorado Kids: Adventures at the Broadmoor Hotel (Bowker, 2022)
  12. The Colors of Culture (InterVarsity Press, 2020)
  13. The Commitment (New Concept Publishing, 2004)
  14. The Complete Writer: A Guide to Tapping Your Full Potential (co-authored as Bev…
  15. The County Register News (regular columnist)
  16. The Courage Fable: Mousey and the Feline Prince
  17. The Courage to Succeed (2004)
  18. The Covered Deep (Worthy Publishing, 2014)
  19. The Cripple Creek Road: A Midland Terminal Guide and Data Book (Pruett Publishi…
  20. The Crusade of Stone and Stars (Tales of Erets Book 1)
  21. The Curse of the Trouble Dolls (Henry Holt & Co., 1992)
  22. The Dauntless Deception, Relic of Time War Series Book 10 (2024)
  23. The Diamond Diva Vendetta (2020, as Jodi Bowersox)
  24. The Dinglehopper Blueberry Belly-Button Snooter (Hawes & Jenkins, 2023)
  25. The Dogwood Series
  26. The Door of the Sad People (Rhyolite Press, 2014)
  27. The Dragon and the Turtle (Waterbrook Press, 2010)
  28. The Dragon and the Turtle (Waterbrook, 2010)
  29. The Dragon and the Turtle Go on Safari (Waterbrook Press, 2011)
  30. The Dragon and the Turtle Go on Sarafi (Waterbrook, 2011)
  31. The Dragon Stone (Rocky Cave Kids series)(Marshall Cavendish, 2011)
  32. The Dragons of Chiril (Waterbrook, 2011)
  33. The Dragons of the Watch (Waterbrook, 2011)
  34. The Drift (Jack Bannister Mysteries: Book 1, Black Mule Press, 2012)
  35. The Drowning Game (Thomas & Mercer, 2025)
  36. The Edge of Darkness (Dark War Chronicles: Book 5, Independently published, 201…
  37. The Entrepreneur's Creed: The Principles and Passions of 20 Successful Entrepre…
  38. The Epsilon Eridani Alternative (Virtual Tales, 2009)
  39. The Eye of Amun (Discoveries of Arthur Grey: Book 3, Panama Hat Publishing, 201…
  40. The Fabric of Hope: An Irish Family Legacy (CreateSpace, 2017)
  41. The Falconer's Lure (written as A. J. Marcus, RenFaire Romance: Book 4, Dreamsp…
  42. The Fall of War (Gods of Olympus: Book 4, CreateSpace, 2017)
  43. The Fantastic 1804 Dollar (co-authored with Eric Newman; Whitman Pub., 1962)
  44. The Fire Within: Reflections on the Literary Imagination (Irie Books, 2019)
  45. The First Batteries: A Celtic Tall Tale (2019)
  46. The First Raven Mocker (Cherokee Chronicles: Book 1, Popul Vuh Publishing, 2013)
  47. The First Space Race: Launching the World's First Satellites (Texas A&M, 2004)
  48. The Five Pearls (CreateSpace, 2009)
  49. The Flame Burning Within (2021) - Devoted Sisters, Contemporary Standalones
  50. The Fluxion Trilogy (Omnibus)(2nd ed., 2017)