Cita APA (7th ed.)
Brown, L. R., Renner, M., Flavin, C., Abramovitz, J. N., & Starke, L. Vital Signs 1997: The Environmental Trends that Are Shaping Our Future. Norton.
Cita Chicago (17th ed.)
Brown, Lester R., Michael Renner, Christopher Flavin, Janet N. Abramovitz, i Linda Starke. Vital Signs 1997: The Environmental Trends That Are Shaping Our Future. Nueva York, EUA: Norton.
Cita MLA (9th ed.)
Brown, Lester R., et al. Vital Signs 1997: The Environmental Trends That Are Shaping Our Future. Norton.
Atenció: Aquestes cites poden no estar 100% correctes.