true or false A primary sources tend to be firsthand observations of an event. B an example of a primary source would be a book review. Solution A> primary sources tend to be firsthand observations of an event. TRUE Explanation: A primary source provides direct or firsthand evidence about an event, object, person, or work of art. B> an example of a primary source would be a book review. FALSE Explanation: Book review is the secondary sources which describe, analyze, summarize, evaluate, discuss, interpret, comment upon and process primary sources..