Illinois Tree City USA :
conference/awards ceremony : Managing the urban forest from inner city to outer edge.
APA Citation
National Arbor Day Foundation., Illinois. Dept. of Natural Resources. (2005). Illinois Tree City USA: conference/awards ceremony : Managing the urban forest from inner city to outer edge. [Springfield, Ill.: Illinois Dept. of Natural Resources].
MLA Citation
National Arbor Day Foundation, and Illinois. Dept. of Natural Resources. Illinois Tree City USA: Conference/awards Ceremony : Managing the Urban Forest From Inner City to Outer Edge. [Springfield, Ill.: Illinois Dept. of Natural Resources], 2005.
Warning: These citations may not always be complete (especially for serials).