All the stories are in the public domain. Here are the sources I copied them from for the sorted word puzzles:
- The Beggars by Lord Dunsany
 - Beyond Lies the Wub by Philip K. Dick
 - Christmas Presents, 1914 from Punch Magazine
 - The Eyes Have It by Philip K. Dick
 - The Failure of Hope & Wandel by Ambrose Bierce
 - The Feast of Nemesis by Saki
 - The Five Boons of Life by Mark Twain
 - The Fox and the Grapes by Aesop
 - The Funny Young Gentleman by Charles Dickens
 - The Kiss by Kate Chopin
 - Luck by Mark Twain
 - Nyarlathotep by H.P. Lovecraft
 - The Talking-Out of Tarrington by Saki
 
Here are the sources for the shuffled pages puzzles:
- The Adventure of the Mazarin Stone by Sir Arthur Conan Doyle
 - The Advocate’s Wedding-Day by Catherine Crowe
 - The Mass of Shadows by Anatole France
 - The Owl’s Ear by Erckmann-Chatrian
 - The Shadows on the Wall by Mary E. Wilkins Freeman
 - The Signal-Man by Charles Dickens
 
Header photo by robfos, and puzzle book image in blog from Wikimedia commons. Both licensed CC-BY.