↑Edward Salisbury Dana (1914) The System of Mineralogy of James Dwight Dana, 1837–1868: Descriptive Mineralogy, John Wiley & Sons, New York (NY), 6e éd., p. 307
↑J. A.[Qui?] Paris (1818): Gregorite discovered at Lanarth. Transactions of the Royal Geological Society of Cornwall 1, 226-227.