APA (7th ed.) Citation

Stein, W. D., & Varela, F. J. (1993). Thinking about biology: An invitation to current theoretical biology. Addison-Wesley.

Chicago Style (17th ed.) Citation

Stein, Wilfred D., and Francisco J. Varela. Thinking About Biology: An Invitation to Current Theoretical Biology. Reading, Mass.: Addison-Wesley, 1993.

MLA (8th ed.) Citation

Stein, Wilfred D., and Francisco J. Varela. Thinking About Biology: An Invitation to Current Theoretical Biology. Addison-Wesley, 1993.