You are required to have a minimum of three sources and all sources must be authoritative; that is, they must be scholarly. You may not use anything from Wikipedia or encyclopedia. However, Google scholar and JSTOR are examples of scholarly search engines outside of library databases. Only use sources that are current, within the last 5 to 10 years.You are required to have a minimum of three sources and all sources must be authoritative; that is, they must be scholarly. You may not use anything from Wikipedia or encyclopedia. However, Google scholar and JSTOR are examples of scholarly search engines outside of library databases. Only use sources that are current, within the last 5 to 10 years.