In other words, information of any sort from a variety of formats: books, articles from magazines/journals, web sites, podcasts, videos, people, reports, news, etc. Also information, evidence, or facts the researcher uses to substantiate an argument.
Printed materials, library online databases, and web sites can contain information from:
Articles from academic journals - - articles written by and for researches and other experts in a field.
Articles from magazines or newspapers - articles written by journalists or professional writers for a general audience.
Audio and video recordings
Books/eBooks - academic books can be edited/written by an expert or group of experts. Some books are written by journalists or professional writers. A book is likely to include an overview of research or issues related to its topic.
Documents from a family or organization
Government documents; for example, U.S. Census data
Photographs or illustrations
Transcripts of speeches