A list of further reading on the subject of the oneness of humanity is available here.
The Writings of Bahá’u’lláh
Tablets of Bahá’u’lláh
View on Bahá’í Reference Library »The Writings and Talks of ‘Abdu’l-Bahá
Paris Talks
View on Bahá’í Reference Library »The Promulgation of Universal Peace
View on Bahá’í Reference Library »Collections from the Bahá’í Writings
Peace: More than an End to War
Compiled by Terrill Hayes, Richard A. Hill, Anne Marie Scheffer, Anne G. Atkinson, Betty J.Fisher. Wilmette, IL: Bahá’í Publishing Trust, 2007.
Letters of the Universal House of Justice
The Promise of World Peace
View on Bahá’í Reference Library »Commentaries
Beyond the Culture of Contest: From Adversarialism to Mutualism in an Age of Interdependence
Michael Karlberg. Oxford: George Ronald Publisher, 2004.
Collective Security within Reach
Sovaida Ma’ani Ewing. Oxford: George Ronald Publisher, 2009.
The Last War: Racism, Spirituality and the Future of Civilization
Mark L. Perry. Oxford: George Ronald Publisher, 2009.
One World, One People: How Globalization is Shaping our Future
Gregory C. Dahl. Wilmette, IL: Bahá’í Publishing, 2008.
Unity: The Creative Foundation of Peace
H. B. Danesh. Toronto: Bahá’í Studies Publications, 1986.