Baker, R. A., & Nickell, J. (1992). Missing pieces: How to investigate ghosts, UFOs, psychics, & other mysteries. Prometheus Books.
Cita Chicago (17th ed.)Baker, Robert A., i Joe Nickell. Missing Pieces: How to Investigate Ghosts, UFOs, Psychics, & Other Mysteries. Buffalo, N.Y: Prometheus Books, 1992.
Cita MLA (9th ed.)Baker, Robert A., i Joe Nickell. Missing Pieces: How to Investigate Ghosts, UFOs, Psychics, & Other Mysteries. Prometheus Books, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.