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Welcome to TC Library Online

A guide to library resources

Sources can be defined at least two different ways. When people use the phrase "types of sources" they may be referring to the:

  1. Level or distance from the original source of information (primary, secondary, tertiary)
  2. Format of the information source (book, article, movie, blog, etc.)

This guide will clarify both types of definitions. Which source is the best? It depends! Each source has unique characteristics which need to be considered when making the decision to use a source for research. Most college instructors and many high school teachers will insist on academic or scholarly sources, but it depends on the assignment.