Lua APA (7ú heag.)
Naranjo, C., & Barnes, P. (2004). The enneagram of society: Healing the soul to heal the world. Gateways Books and Tapes.
Lua i Stíl Chicago (17ú heag.)
Naranjo, Claudio, agus Paul Barnes. The Enneagram of Society: Healing the Soul to Heal the World. Nevada City, Calif.: Gateways Books and Tapes, 2004.
Lua MLA (9ú heag.)
Naranjo, Claudio, agus Paul Barnes. The Enneagram of Society: Healing the Soul to Heal the World. Gateways Books and Tapes, 2004.
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