source: Keith Haring (2010). “Keith Haring Journals: (Penguin Classics Deluxe Edition)”, p.105, Penguin
topic: Men, Drawing, Magic, Prehistoric, Prehistoric Man

source: Robert Orben (2011). “2100 Laughs for All Occasions: Short, Sharp, Topical, and Funny--Arranged in Categories for Reading, Telling, Laughing”, p.7, Main Street Books
topic: Humor, Fighting, Two, Times Of Crisis, Modern Times
topic: Glasses, Cities, Long, Prehistoric, Prehistoric Times
source: "Philip Roth was wrong" by Robert Winston, www.theguardian.com. December 16, 2005.
topic: Feet, Immature, Needs, Mature And Immature, Prehistoric
topic: Animal, Elephants, Earth, Prehistoric Times
topic: Cat, Practice, Bird, Prehistoric Times
topic: Believe, Men, Order, Social Order, Death Wish
source: Marq De Villiers (2001). “Water: The Fate of Our Most Precious Resource”, p.12, Houghton Mifflin Harcourt
topic: Water, Mind, Environmental, Water Resources, Prehistoric