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:
Fieldwork ready: An introductory guide to field research for agriculture, environment and soil
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Handbook of Citizen Science in Ecology and Conservation
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Oral history and the environment : Global perspectives on climate, connection, and catastrophe
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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.
Oxford Dictionary of Environment & Conservation, 3rd ed.
Oxford Dictionary of Ecology, 5th ed.
Oxford Dictionary of Energy Science