You can search for environmental studies research methods titles in OneSearch via keyword and subject heading searches. You'll find more results if you start with a keyword search (e.g., "environmental science" AND "research method*") then switch to a subject heading search if you need more specific results. Some of the subject headings for environmental studies research methods include:
A review article offers a summary and analysis of previously published literature on a given subject. Using a review article may help you narrow your research topic and inspire a wave of ideas for searching the literature. These articles feature extensive bibliographies, which may lead to important authors in your field of research.
If you need to find a subject-specific dictionary in OneSearch, try a keyword search for your discipline / topic and add "dictionaries" as one of your search terms.