Selected resources below are starting points to help you find evidence to support your arguments for your writing assignments.
Primary sources provide direct or firsthand evidence about an event, object, person, etc. Examples include eyewitness accounts, historical and legal documents, results of experiments, government documents, statistical data, pieces of creative writing, audio and video recordings, speeches, art objects, interviews, surveys, fieldwork, email communications, and more. In natural and social science field, primary sources are often empirical studies - research where an experiment was performed or a direct observation was made.
Secondary sources describe, discuss, analyze, interpret, and evaluate primary sources. Secondary sources are created later by someone who did not experience first-hand or participate in the events or conditions you're researching. For the purposes of a historical research project, secondary sources are generally scholarly books and articles.