There are other guides that you might find useful, depending on specific areas of interest. A few are listed here but even more exist.
This guide brings together resources to help in research assignments for the Environmental Health course. Tabs are labeled to identify the topic covered on that page, such as:
Interested in tools or tips for your research?
View NU Library's research tutorials covering things like how to pick a manageable research topic, choose effective search terms, locate peer-reviewed articles and more. View videos, slides and checklists!
Environmental Health by 
There are other guides that you might find useful, depending on specific areas of interest. A few are listed here but even more exist.