• http://www.ehow.com/info_8649362_careers-use-logarithms.html​

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• http://archaeologylogs.blogspot.com/​

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• http://www.coolmath.com/algebra/17-exponentials-logarithms/13-radioactive-decay-decibel-levels-03​

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• http://www.maa.org/press/periodicals/convergence/logarithms-the-early-history-of-a-familiar-function-introduction

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• http://www.maa.org/press/periodicals/convergence/logarithms-the-early-history-of-a-familiar-function-john-napier-introduces-logarithms