Samuel Has Been Working Hard on His History Paper

Samuel has been working hard on his history paper. He has gathered his sources and started jotting down his ideas. The paper is due in two weeks and he wants to start writing. He knows there are a couple of things he should do first to help make writing the paper go more smoothly. Samuel has gathered lots of sources. He wants to be sure he gives credit with the appropriate text as he writes his paper. He has the information on a variety of note cards but they are hard to shuffle through each time he wants to find a source. How can Samuel add the reference information as he writes and at the same time organize his sources?