Open Game License v 1.0a © 2000, Wizards of the Coast, Inc.
System Reference Document © 2000, Wizards of the Coast, Inc.; Authors: Jonathan Tweet, Monte Cook,
and Skip Williams, based on material by E. Gary Gygax and Dave Arneson.
Pathfinder Campaign Setting: Occult Mysteries © 2014, Paizo Inc.; Authors: Jason Bulmahn, Crystal Frasier, Jim Groves, Brandon Hodge, James Jacobs, Erik Mona, F. Wesley Schneider, and Jerome Virnich.
Poltergeist from the Tome of Horrors Complete © 2011, Necromancer Games, Inc., published and distributed by Frog God Games; Author: Scott Greene, based on original material by Lewis Pulsipher.