Two Quotes - Page 81
There are two ways to write error-free programs; only the third one works.
"Epigrams on Programming". ACM "SIGPLAN" Notices 17 (9), (pp. 7-13), September 1982.
"Mind is a Myth". Book by U. G. Krishnamurti. Ch. 3: Not Knowing Is Your Natural State, 1987.
"The Columbia Dictionary of Quotations". Book by Robert Andrews, p. 894, 1993.
"Fictional character: Mrs. O'Brien". "The Tree of Life", May 2011.
Samuel Butler (2014). “The Notebooks of Samuel Butler”, p.377, The Floating Press