Title: The GCHQ Puzzle Book II, Author: GCHQ
Title: Puzzles 101: A PuzzleMasters Challenge, Author: Nobuyuki Yoshigahara
Title: The GCHQ Puzzle Book II, Author: GCHQ
Title: Mind Benders Brain Teasers & Puzzle Conundrums, Author: Vikas Khatri
Title: The Reminiscence Puzzle Book: 1930s-1980s, Author: Robin Dynes