Wilber, K. (2000). Grace and grit: Spirituality and healing in the life and death of Treya Killam Wilber (2nd ed.). Shambhala.
Citazione stile Chigago Style (17a edizione)Wilber, Ken. Grace and Grit: Spirituality and Healing in the Life and Death of Treya Killam Wilber. 2nd ed. Boston: Shambhala, 2000.
Citatione MLA (9a ed.)Wilber, Ken. Grace and Grit: Spirituality and Healing in the Life and Death of Treya Killam Wilber. 2nd ed. Shambhala, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.