APA (7th ed.) Citation

Maturana, H. R., & Varela, F. J. (1987). The tree of knowledge: The biological roots of human understanding. Shambhala.

Chicago Style (17th ed.) Citation

Maturana, Humberto R., and Francisco J. Varela. The Tree of Knowledge: The Biological Roots of Human Understanding. Boston: Shambhala, 1987.

MLA (9th ed.) Citation

Maturana, Humberto R., and Francisco J. Varela. The Tree of Knowledge: The Biological Roots of Human Understanding. Shambhala, 1987.