Robert Kennedy, "Chemical Analysis of an Uncommon Species of Zeolite", in Transactions of the Royal Society of Edinburgh, vol. V, 1805, p. 295–303
Lithophilus (pseudonyme), Lettre du 29 juin 1818 "To Mr. [Alexander] Tilloch", in The Philosophical Magazine and Journal, vol. LII, no. 248, Londres, 1818 (second semestre), p. 66–67
