Cita APA (7th ed.)

Young, J. E., & Ayres, E. (1994). The next efficiency revolution: Creating a sustainable materials economy. Worldwatch Institute.

Cita Chicago (17th ed.)

Young, John E., i Ed Ayres. The Next Efficiency Revolution: Creating a Sustainable Materials Economy. Washington, DC: Worldwatch Institute, 1994.

Cita MLA (9th ed.)

Young, John E., i Ed Ayres. The Next Efficiency Revolution: Creating a Sustainable Materials Economy. Worldwatch Institute, 1994.