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The University of Massachusetts Amherst

Environmental Science and Conservation

Government-sponsored information online

Government agencies such as the USDA Forest Service, produce many scientific publications you can easily access online, such as this one:

Kline, Jeffrey D.; Mazzotta, Marisa J. 2012. Evaluating tradeoffs among ecosystem services in the management of public lands. Gen. Tech. Rep. PNWGTR-865. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 48 p

See the links above for ideas regarding where to start looking for similar publications.

CRS Reports

The Congressional Research Service (CRS) is the non-partisan public policy research arm of the United States Congress.

CRS experts prepare reports to assist members of Congress throughout the legislative process providing background information and data on public policy issues.

How to cite a CRS report APA 7th edition:
Author, A. A. (Year). 
Title of report in sentence case and italics (CRS Report No. xxxxxxx). Retrieved from Congressional Research Service website: URL

Example: 
Erwin, M. C. (2011). Intelligence issues for Congress (CRS Report No. RL33539). Retrieved from Congressional Research Service website: http://www.fas.org/sgp/crs/intel/RL33539.pdf