Oscar Wilde (2008). “The Importance of Being Earnest and Other Plays: Lady Windermere's Fan; Salome; A Woman of No Importance; An Ideal Husband; The Importance of Being Earnest”, p.205, OUP Oxford
John Joseph Griffin (1834). “Chemical Recreations: A Series of Amusing and Instructive Experiments, which May be Performed with Ease, Safety, Success, and Economy ; to which is Added, The Romance of Chemistry : an Inquiry Into the Fallacies of the Prevailing Theory of Chemistry : with a New Theory and a New Nomenclature”, p.232