There are three main types of information sources: primary, secondary, and tertiary. Primary sources are original materials that have not been analyzed, like speeches or photographs. Secondary sources discuss or analyze primary sources, such as commentaries or history journals. Tertiary sources compile primary and secondary sources, like bibliographies or encyclopedias. When using information from any source, it should be accurate, complete, timely, consistent, relevant, and unique. News reports are also an important information source, with parts like the headline, byline, lead, body, and ending.