Encyclopaedia of Scientific Units, Weights, and Measures: Their SI Equivalences and Origins, Springer, 2003, صفحات 76–78, ISBN 9781852336820, مؤرشف من الأصل في 18 مايو 2016 الوسيط |CitationClass= تم تجاهله (مساعدة); الوسيط |separator= تم تجاهله (مساعدة)CS1 maint: ref=harv (link).
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