A quick checklist:
1. Where did you find the source? Did you use a scholarly database? UC Library Search?
2. Who's responsible for the work? Is it published by a university press or another known scholarly publisher? What are the author's credentials? Is the author a professor or other known academic or scholar?
3. Does it look like a scholarly work? Does it have footnotes and/or endnotes and/or a bibliography? What kinds of sources is it citing? Where did the author get their information? What research methodology are they using?
Additionally, depending on your specific area of research, you may want to run searches in these tools for related disciplines or multidisciplinary areas.
Database of digitized books, images, documents, essays and bibiographies documenting women's reform activities in the U.S., mostly from the 19th and 20th centuries.