Παραπομπή σε μορφή APA (7η εκδ.)

Wilber, K., & Wilber, T. K. (2000). Grace and grit: Spirituality and healing in the life and death of Treya Killam Wilber (Second edition.). Shambhala.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Wilber, Ken, και Treya Killam Wilber. Grace and Grit: Spirituality and Healing in the Life and Death of Treya Killam Wilber. Second edition. Boston: Shambhala, 2000.

Παραπομπή σε μορφή MLA (9th εκδ.)

Wilber, Ken, και Treya Killam Wilber. Grace and Grit: Spirituality and Healing in the Life and Death of Treya Killam Wilber. Second edition. Shambhala, 2000.