APA

Greaver, T., Sullivan, T., Herrick, J., Barber, M., Baron, J., Cosby, B., Deerhake, M., Dennis, R., Dubois, J., Goodale, C., Herlihy, A., Lawrence, G., Liu, L., Lynch, J., & Novak, K. (2012). Ecological effects of nitrogen and sulfur air pollution in the US: what do we know?. : The Ecological Society of America.