Lopez, D. Films by genre, c1993 (ghost film: Apparitions (spirits, ghosts, poltergeists, wraiths, revenants) take many configurations and manifest themselves in a variety of different ways; may be friendly or unfriendly, horrible or cute; may inspire laughter or fear; see also Haunted house film and Fantasy film: ghost comedies)

Moving image genre/form guide via WWW, Oct. 26, 2007 (entry for horror films: Frequently [in horror films], haunted houses, ghosts, werewolves, zombies, vampires, or the diabolical are depicted)

Cataloging service bulletin no. 49 (summer 1990): p. 52, changes to Moving image materials, 1988 (Ghost stories UF Haunted house films and programs)

Wikipedia website, July 23, 2007 (Ghost films; Ghost movies)

Wikipedia, Aug. 11, 2022 (Category:Paranormal films. Films about the paranormal, purported phenomena described in popular culture, folk, and other non-scientific bodies of knowledge, whose existence within these contexts is described as beyond normal experience or scientific explanation; paranormal phenomena include extrasensory perception (ESP), telekinesis, ghosts, poltergeists, life after death, reincarnation, faith healing, human auras, and so forth)