^Pages 325 and 330, The Journal of the Royal Asiatic Society of Great Britain and Ireland for the Second Half‑year of 1916 (‘The Chinese Numerals and Their Notational System’, L. C. Hopkins)
^Page 315, The Journal of the Royal Asiatic Society of Great Britain and Ireland for the Second Half-year of 1916 (‘The Chinese Numerals and Their Notational System’, L. C. Hopkins)