Cita APA

Brown, L. R., Renner, M., & Halweil, B. (1999). Vital signs: The environmental trends that are shaping our future (3a. ed.). New York (EUA): Norton company,.

Citación estilo Chicago

Brown, L. R., M. Renner, y B. Halweil. Vital Signs: The Environmental Trends That Are Shaping Our Future. 3a. ed. New York (EUA): Norton company,, 1999.

Cita MLA

Brown, L. R., M. Renner, y B. Halweil. Vital Signs: The Environmental Trends That Are Shaping Our Future. 3a. ed. New York (EUA): Norton company,, 1999.