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:
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常委会组成人员152人出席会议，出席人数符合法定人数。
На Западе подчинили рой насекомых для разведки в интересах НАТО08:43。业内人士推荐服务器推荐作为进阶阅读