大部分爭論圍繞著不同研究者使用的不同調查方法。
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China Deploys Thousands of Fishing Boats off Japan’s Coast, and They Are Not There to Fish，详情可参考同城约会
The “Knocking on Wood” Wikipedia page mentions Roud’s conclusion, and this claim of a 19th century origin has circulated online as the final say on the matter. If you go back to the original, though, Roud’s proposal actually ends on an ambivalent note: “Before this theory [of 19th century origins] can be finally accepted, however, an examination of the history of European forms of this custom would be advisable.”