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Dyfyniad Arddull ChicagoKatz, Michael, William Parker Marsh, and Gail Gordon Thompson. Earth's Answer: Explorations of Planetary Culture at the Lindisfarne Conferences. New York: Lindisfarne Books, 1977.
Dyfyniad MLAKatz, Michael, et al. Earth's Answer: Explorations of Planetary Culture at the Lindisfarne Conferences. Lindisfarne Books, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.