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Mathematicians boast of their exacting achievements, but in reality they are absorbed in mental acrobatics and contribute nothing to society.
Complete Works on Japan's Philosophical Thought, 1956.
Fibonacci and Square Numbers
 Fibonacci, Leonardo Pisano. The Book of Squares. Translated by L. E. Sigler. Boston: Academic Press, 1987.
 Grant, Edward. A Source Book in Medieval Science. Cambridge, MA: Harvard University Press, 1974.
 Monteferrante, Sandra. "Leonardo of Pisa: Bunny Rabbits to Bull Markets ." Convergence. 31 July 2006.
 Vogel, Kurt. "Fibonacci, Leonardo or Leonardo of Pisa." Dictionary of Scientific Biography. Vol. 4. New York: Chas. Scribner's Sons (1970), pp. 604-613.