Dyfyniad APA

Brown, L. R., Flavin, C., Renner, M., & Starke, L. (1999). Vital signs 1999: The environmental trends that are shaping our future. W.W. Norton.

Dyfyniad Arddull Chicago

Brown, Lester Russell, Christopher Flavin, Michael Renner, and Linda Starke. Vital Signs 1999: The Environmental Trends That Are Shaping Our Future. New York: W.W. Norton, 1999.

Dyfyniad MLA

Brown, Lester Russell, et al. Vital Signs 1999: The Environmental Trends That Are Shaping Our Future. W.W. Norton, 1999.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.