^References to it will be found in the Journal of the Royal Microscopical Society for 1899, p. 355; 1902, p. 385; 1904, p. 393; 1910, pp. 5, 144, 701 and 801; 1911, pp. 160, 421 and 449. In the 1910 volume, on pages 239 and 243, there is an interesting note by Grayson himself "On the Production of Micrometric and Diffraction Rulings".
^Grayson, Henry J. (1900). "Australasian Association for the Advancement of Science" ع. Eighth Meeting: 183–191. {{استشهاد بدورية محكمة}}: الاستشهاد بدورية محكمة يطلب |دورية محكمة= (مساعدة)
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