Cita APA (7a ed.)

Cunningham, W. P., Cunningham, M. A., & Saigo, B. W. (2007). Environmental science: A global concern (9th ed.). McGraw-Hill Higher Education.

Cita Chicago Style (17a ed.)

Cunningham, William P., Mary Ann Cunningham, y Barbara Woodworth Saigo. Environmental Science: A Global Concern. 9th ed. Boston [etc.]: McGraw-Hill Higher Education, 2007.

Cita MLA (9a ed.)

Cunningham, William P., et al. Environmental Science: A Global Concern. 9th ed. McGraw-Hill Higher Education, 2007.