Alexandra David-Néel
The Secret Lives of Alexandra David-Neel - A Biography of the Explorer of Tibet and Its Forbidden Practices, Barbara and Michael Foster. ; American edition under the title Forbidden Journey -  The Life of Alexandra David-Neel, . 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."