Tertiary sources are one further step removed from that. Tertiary sources summarize or synthesize the research in secondary sources. For example, textbooks and reference books are tertiary sources.Click to see full answer. Considering this, what is considered tertiary source?Tertiary sources are sources that identify and locate primary and secondary sources. These can include bibliographies, indexes, abstracts, encyclopedias, and other reference resources; available in multiple formats, i.e. some are online, others only in print.Also Know, is history com a tertiary source? Tertiary sources are publications that summarize and digest the information in primary and secondary sources to provide background on a topic, idea, or event. Encyclopedias and biographical dictionaries are good examples of tertiary sources. Also Know, what are some examples of tertiary sources? Examples of Tertiary Sources: Dictionaries/encyclopedias (may also be secondary), almanacs, fact books, Wikipedia, bibliographies (may also be secondary), directories, guidebooks, manuals, handbooks, and textbooks (may be secondary), indexing and abstracting sources.Are tertiary sources reliable? TERTIARY SOURCES DEFINED Because it has been filtered through many reviewers, it tends to consist of highly reliable and accurate information, plus contain broad perspectives of topics. Use tertiary sources for a general overview of your topic and for background information for your research.