Comment: If you want to get real

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In reply to comment: I don't want to sound like a (see in situ)

If you want to get real

If you want to get real technical, it should be written as 老子.

If you are going to use romanization to sound out the words for Westerners, then there are multiple systems of romanization that have been developed for Zhongwen. Wade-Giles would have been the most common form of romanization when those texts were becoming popular over here.