APA (7th ed.) Citation

Fort Holli. (2009). Picture puzzles: How many differences can you find? Publications International.

Chicago Style (17th ed.) Citation

Fort Holli. Picture Puzzles: How Many Differences Can You Find? Illionis: Publications International, 2009.

MLA (8th ed.) Citation

Fort Holli. Picture Puzzles: How Many Differences Can You Find? Publications International, 2009.

Warning: These citations may not always be 100% accurate.