(EN) J Gordon Melto, Vampire: A Chronology, in The Vampire Book: The Encyclopedia of the Undead, 10ª ed., Detroit, Visible Ink Press,, 2011 [1994], p. XXIII, ISBN 978-1-57859-281-4. URL consultato il 23 marzo 2017.
«1894 - H. G. Wells's short story Flowering of the strange orchid is a precursor to science fiction vampire story»