What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
不過，作為中式酒樓集團董事的楊振年說：「我們接觸到一些辦宴會，譬如是婚宴的，其實有很多新人養了狗，過去是不能來婚宴場地的。要是我們能辦這些婚宴，而能讓寵物犬來的話，這可能多不少生意。」
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