Illinois Tree City USA conference/awards ceremony.
APA Citation
Illinois. Dept. of Natural Resources., Illinois Public Health Association., Urban and Community Forestry Program (U.S.)., Urban Forestry Program (Ill.)., National Arbor Day Foundation. (2009). Illinois Tree City USA conference/awards ceremony. Springfield, Ill.: Illinois Dept. of Natural Resources, Urban and Community Forestry Program.
MLA Citation
National Arbor Day Foundation, et al.. Illinois Tree City USA Conference/awards Ceremony. Springfield, Ill.: Illinois Dept. of Natural Resources, Urban and Community Forestry Program, 2009.
Warning: These citations may not always be complete (especially for serials).