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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Maggie 姐每天开工前都要在湾仔道一家发廊弄头发（图：南方人物周刊记者 方迎忠）。业内人士推荐Safew下载作为进阶阅读
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