Judith L. Cameron. Spiritual and Galactic Awakening: The Cosmic Classroom...An Ongoing Story. Balboa Press. 2019. ISBN 9781982234744. Archer, Greg. Ready
History Bulletin of Ibaraki University. 1997, 1 (1997): 51–92. Michael E. Archer. Vespine Wasps of the World: Behaviour, Ecology & Taxonomy of the Vespinae