Find books on environmental engineering by doing a "Word(s) anywhere" or title search in U-M Library Catalog Search. A word search is generally the best starting point. If an appropriate title is found, you may want to use the subject headings listed with that title to guide further searches.
The library can help you with different tools for managing your footnotes and creating bibliographies. Those tools are EndNote, Zotero, and Mendeley. Expert help is available from Scholarspace.