Wilber, K. (2000). Grace and grit: Spirituality and healing in the life and death of Treya Killam Wilber (2nd ed.). Shambhala.
Citace podle Chicago (17th ed.)Wilber, Ken. Grace and Grit: Spirituality and Healing in the Life and Death of Treya Killam Wilber. 2nd ed. Boston: Shambhala, 2000.
Citace podle MLA (9th ed.)Wilber, Ken. Grace and Grit: Spirituality and Healing in the Life and Death of Treya Killam Wilber. 2nd ed. Shambhala, 2000.
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