1. Schaum's Outline of Abstract Algebra (McGraw Hill, 1999)
  2. Schaum's Outline of Theory and Problems of Advanced Calculus, 2nd ed. (co-autho…
  3. Schism (Book 2, The Alchemist Saga, CreateSpace, March 2018)
  4. Screechers (with Kevin J. Kennedy, Independently published, 2019)
  5. Season of Fire (Remnants: Book 2, Blink, 2016)
  6. Season of Glory (Remnants: Book 3, Blink, 2016)
  7. Season of Wonder (Remnants: Book 1, HarperCollins Christian Pub., 2015)
  8. Seasons of the Raptor: One Year Photographing Colorado's Raptors (2022)
  9. Sebastian: The Cat That Never Shaved (2014)
  10. Second to None (2nd ed., 2017)
  11. Second Year Setbacks (Hunter Academy: Book 2, 2021)
  12. SECRETS (Self-published, 2016)
  13. Secrets of the Professional Freelancer (as Bev Walton-Porter)(Triple Crow Publi…
  14. SECRETS: Past Unveiled (Self-published, 2017)
  15. Sedendum (Independently published, 2020)
  16. Seeing the Invisible (Broadman Press, 1987)
  17. Selah (The Sugar Baron’s Daughters: Book 3, Bethany House, 2020)
  18. Self Destruct (Destroy Series book 1)(2013)
  19. Self-Fashioning in Margaret Atwood’s Fiction: Dress, Culture, and Identity (Pet…
  20. Servant of God: A Story of Saint Oscar Romero (2020)
  21. Several articles and book reviews appear in The Veteran, the newspaper of the V…
  22. Several articles contributed to Yahoo! Voices in 2014
  23. Shadow Atlas: Dark Landscapes of the Americas, (co-editor, Hex Pub., Nov. 2021).
  24. Shadow of the Gallows (Zebra, 1987)
  25. Shadows of Existence: Discoveries and Speculations in Zoology (Hancock House, 2…
  26. Shadows of the Soul (as Bev Walton-Porter)(Triple Crow Publishing, 2011)
  27. Shadows on an Iron Curtain (Blue Harmony Press, 2006)
  28. Shaken & Stirred (Independently published, 2022)
  29. Shards of Light: Healer Book 2 (YA fiction, Vinspire Publishing, 2019)
  30. Shattered: Stories of Children and War (contributing author)(Knopf, 2002)
  31. SHE SHIFTER (Forthcoming, 2023)
  32. She: Stories of a Woman (fiction, 2011)
  33. Sherlock Holmes in Little London: 1896 The Missing Year (Circle Star Publishing…
  34. Shifting Fate (Independently published, 2023)
  35. Shooting Blanks (Superluminal Velocity Books, 2015)
  36. Shoreline of the Heart (Shanti Arts, 2019)
  37. Shotgun Canyon (Zebra, 1990)
  38. Side Streets and Dark Alleys: A Collection of Short Stories (CreateSpace, 2016)
  39. Signs in the Dark (YA fiction, Vinspire Publishing, 2020)
  40. Simply the Savior (David C. Cook, 1998)
  41. Simulation Validation: A Confidence Assessment Methodology (co-author) (IEEE/Co…
  42. Simulation Validation: A Confidence Assessment Methodology (with Deborah C. Ara…
  43. Sing: A Novel of Colorado (Homeward Trilogy: Book 2, Bethany House/Baker Publis…
  44. Skeletons in the Closet: Phantom Rising Book #2 (Illuminus Publishing LLC, 2016)
  45. Slade (Jackson Creek Series: Book 1, 2017)
  46. Slayer with a Grey Toupee: An Axel Hatchett Mystery (#3)(Blood and Thunder Pres…
  47. Sleeper Protocol (The Protocol War: Book 2, Red Adept Publishing, 2016)
  48. Sleepwalkers (AuthorHouse, 2001)
  49. Sleight of Hand (Parlor Tricks Mystery: Book 4, NovaLynn Press LLC, 2023)
  50. Slow on the Clicker (PublishAmerica, 2009)