1. Altman, Nathaniel. 2000. Sacred Trees: Spirituality, Wisdom and Well-Being. New York: Sterling Publishing Co.
2. Altmann, Stuart A. 2009. Fallback foods, eclectic omnivores, and the packaging problem. American Journal of Physical Anthropology 140: 615–629.
3. Anderson, Richard L. 1990. Calliope’s sisters: A comparative study of philosophies of art. Englewood Cliffs: Prentice Hall.
4. Anderson, Kit. 2003. Nature, culture, and big old trees: Live oaks and ceibas in the landscapes of Louisiana and Guatemala. Austin: University of Texas Press.
5. Bagshawe, F.J. 1925. The peoples of the happy valley (East Africa): The aboriginal races of Kondoa Irangi. Part 2: The Kangeju. Journal of the African Society 24 (94): 117–130.