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- Numerology: Or, What Pythagoras Wrought (MAA 1997, 10th edition), p.
^ Numerology: Or, What Pythagoras Wrought (MAA 1997, in lần thứ 10), tr. - Numerology: Or, What Pythagoras Wrought (MAA 1997, 10th edition), p.
^ Numerology: Or, What Pythagoras Wrought (MAA 1997, in lần thứ 10), tr. - Numerology: Or, What Pythagoras Wrought (MAA 1997, 10th edition), p.
^ Numerology: Or, What Pythagoras Wrought (MAA 1997, in lần thứ 10), tr. - Numerology: Or, What Pythagoras Wrought (MAA 1997, 10th edition), p.
^ Numerology: Or, What Pythagoras Wrought (MAA 1997, in lần thứ 10), tr. - Numerology: Or, What Pythagoras Wrought (MAA 1997, 10th edition), p.
Numerology: Or, What Pythagoras Wrought (MAA 1997, in lần thứ 10), tr.