Foster, Barbara and Michael. The Secret Lives of Alexandra David-Neel - A Biography of the Explorer of Tibet and Its Forbidden Practices. ISBN 1-58567-329-3; American edition under the title Forbidden Journey - The Life of Alexandra David-Neel, ISBN 0-06-250345-6. This book is based on extensive interviews with David Neel's secretary at Digne and reading her letters to her husband, now published as "Journal de voyage: lettres a son mari."
Middleton, Ruth (1989). Alexandra David-Neel. Boston, Shambhala. ISBN 1-57062-600-6.
Norwick, Braham. (1976).Alexandra David-Neel's Adventures in Tibet: Fact or Fiction. The Tibet Journal. Vol. 1, Nos. 3 & 4. Autumn 1976, pp. 70–74.