Cita APA (7a ed.)

Maturana, H. R., & Varela, H. R. (1992). The Tree of knowledge: : the biological roots of human understanding (Revised edition.). Shambhala.

Cita Chicago Style (17a ed.)

Maturana, Humberto R., y Humberto R. Varela. The Tree of Knowledge: : The Biological Roots of Human Understanding. Revised edition. Boston ; London: Shambhala, 1992.

Cita MLA (9a ed.)

Maturana, Humberto R., y Humberto R. Varela. The Tree of Knowledge: : The Biological Roots of Human Understanding. Revised edition. Shambhala, 1992.