[en] Nature Spirituality From the Ground Up Llewellyn Publications

[nl] A fine and bitter snow New York : St. Martin's Minotaur, 2002.

[en] [Gutenberg 63510] • The Kernel and the Husk · Letters on Spiritual Christianity

[en] The River Why Little Brown and Company

[en] If Nietzsche Were a Narwhal · What Animal Intelligence Reveals About Human Stupidity Little, Brown and Company

[en] Eiderdown Rose and Star Press

[en] Walking the Himalayas Little Brown and Company

[en] J. M. Coetzee and Ethics Columbia University Press

[en] The Water Will Come Little Brown and Company

[en] Never Out of Season Little Brown and Company

[en] The Last Unicorn Little Brown and Company

[en] The Death of the Animal Columbia University Press

[en] Experiencing Animal Minds Columbia University Press

[en] Beyond Words · What Animals Think and Feel Henry Holt and Co.

[en] [Gutenberg 52782] • Aaron in the Wildwoods Boston, New York, Houghton, Mifflin and Company

[en] [Gutenberg 27951] • Policeman Bluejay Lighthouse Books for Translation and Publishing

[en] The Evolution of Calpurnia Tate Henry Holt and Company

[en] Southeaster And Other Stories

[en] An Old Babylonian Version of the Gilgamesh Epic Book Tree

[en] 1914 Sheba Blake Publishing