SIRIANNI, CARMEN, and STEPHANIE SOFER. “Environmental Organizations.” The State of Nonprofit America, edited by Lester M. Salamon, 2nd ed., Brookings Institution Press, Washington, D.C., 2012, pp. 294–328, www.jstor.org/stable/10.7864/j.ctt1xx6fn.10. Accessed 28 Jan. 2021.
SIRIANNI, C., & SOFER, S. (2012). Environmental Organizations. In Salamon L. (Ed.), The State of Nonprofit America (pp. 294-328). Washington, D.C.: Brookings Institution Press. Retrieved January 28, 2021, from http://www.jstor.org/stable/10.7864/j.ctt1xx6fn.10
SIRIANNI, CARMEN, and STEPHANIE SOFER. "Environmental Organizations." In The State of Nonprofit America, edited by Salamon Lester M., 294-328. Washington, D.C.: Brookings Institution Press, 2012. Accessed January 28, 2021. http://www.jstor.org/stable/10.7864/j.ctt1xx6fn.10.
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