Cita APA (7th ed.)

Thayer, R. L. (1994). Gray world, green heart: Technology, nature, and sustainable landscape. Wiley.

Cita Chicago (17th ed.)

Thayer, Robert L. Gray World, Green Heart: Technology, Nature, and Sustainable Landscape. New York: Wiley, 1994.

Cita MLA (9th ed.)

Thayer, Robert L. Gray World, Green Heart: Technology, Nature, and Sustainable Landscape. Wiley, 1994.