Cardeña, Etzel. “Celebrating Three Consciousness Trailblazers : Jeanne Achterberg, Ruth-Inge Heinze, and Stanley Krippner”. Journal of Anomalous Experience and Cognition 4, no. 1 (June 5, 2024): 6–12. Accessed December 21, 2024. https://journals.lub.lu.se/jaex/article/view/26220.