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Science is built up with facts, as a house is with stones. But a collection of facts is no more a science than a heap of stones is a house.
La Science et l'hypothese.
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.