Regla de cálculo (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Regla de cálculo" in Spanish language version.

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Castleden, Rodney (2007). Inventions that Changed the World. Futura. p. 157. ISBN 978-0-7088-0786-6. «With the invention of the calculator the slide rule became instantly obsolete.»
Denning, Peter J.; Metcalfe, Robert M. (1998). Beyond calculation: the next fifty years of computing. Springer. p. xiv. ISBN 978-0-387-98588-6. «The first hand calculator appeared in 1972 and made the slide rule obsolete overnight.»