a source that has credibility is; which source has the best credibility for a research paper about the battle of gettysburg?; which answer choice is the best summary of the excerpt?; before using a source of information, you must first; a source that has credibility is reliable. questionable. popular. old.; which statement correctly describes a summary?; which detail from the excerpt is a minor detail that is not necessary in a summary of the excerpt?; to cite a source of information means to