"A Poet with a Slide Rule: Piet Hein Bestrides Art and Science," by Jim Hicks, Life Magazine, Vol. 61 No. 16, 10/14/66, pp.55-66
Grooks, by Piet Hein, (1998) Borgens Forlag; ISBN 8741810791
Collected Grooks I, by Piet Hein Borgens Forlag; ISBN 8721018596
Collected Grooks II, by Piet Hein Borgens Forlag; ISBN 8721018618
參考
马丁·加德纳: Piet Hein's Superellipse. - in Gardner, Martin: Mathematical Carnival. A New Round-Up of Tantalizers and Puzzles from Scientific American. New York: Vintage, 1977, pp. 240-254.
Johan Gielis: Inventing the circle. The geometry of nature. - Antwerpen : Geniaal Press, 2003. - ISBN 9080775614