ジョン・フランシス・キャンベル
↑ "Campbell, John Francis," in Encyclopædia Britannica (11th ed., 1911).
↑ John Francis Campbell, Frost and Fire, natural engines, tool marks and chips, 1865.
↑ John Francis Campbell's Letter to C.A. McVean dated December 27, 1874, Shimosua, McVean Archives.
↑ John Francis Campbell, My Circular Notes, 2 volumes, 1876.