This page links to guides that discuss the full research process, with sections about how grey literature fits into the research process.

United States

Research Process, A Step-by-Step Guide: Grey Literature [Billings Library, Montana State University] [LIBGUIDE]
http://libguides.msubillings.edu/c.php?g=242178&p=1610614

Developing an Argument through Grey Literature [Brooklyn Law Institute, New York]
http://guides.brooklaw.edu/c.php?g=330912&p=2222408

Research Process, A Step-by-Step Guide: Grey Literature [Georgia Tech University] [RESEARCH GUIDE]
http://libguides.gatech.edu/c.php?g=54271&p=350386

Research Process: Grey Literature [North Central University, Minnesota] [LIBGUIDE] 
https://ncu.libguides.com/researchprocess/greyliterature

The Research Process –  A Guide for OCC Students: Grey Literature [Orange Coast College, California] [LIBGUIDE] 
http://libguides.orangecoastcollege.edu/c.php?g=480848&p=3287265

How to Do Research: A Step-by-Step Guide [Elmira College, New York] [LIBGUIDE]
https://libguides.elmira.edu/research/grey_lit