Key reading: A. Gauld & A. D. Cornell (1979). Poltergeists. Routledge & Kegan Paul (https://www.amazon.com/Poltergeists-Alan-Gauld/dp/1786770393?_encoding=UTF8&dib_tag=se&dib=eyJ2IjoiMSJ9.TwRkD7zeNdzetR-83O7nyA.4aZf8W0oQh1A8yd8bEvvj4J6nYIX-OQac1K5BKX80w0&qid=1753766617&sr=8-1&linkCode=ll1&tag=forbiddenhist-20&linkId=3f4fbfd341d83cd1297e966838033911&language=en_US&ref_=as_li_ss_tl) (affiliate link).