Which of the following is commonly used as a print source for research?

• A. Websites
• B. Videos
• C. Podcasts
• D. Books

Answer: (D)

Print sources are physical, paper-based materials researchers use for information gathering. Books are classic print sources because they are printed on paper and typically provide in-depth coverage of a topic, organized into chapters with a structured argument, an author or editors, publication date, and a bibliography or footnotes to verify information and guide further reading. This combination of depth, organization, and verifiable sourcing is what makes books a standard print source for research.

Websites, videos, and podcasts are not print materials; they are digital or audiovisual formats. They often require online access and can vary in permanence and citation details, so they don't fit the 'print source' category, even though they can be valuable for research.

So, when selecting a print source among the options, books best fit the description.