Record as you go. A ruled index card An index card or system card in Australian English consists of card stock heavy paper cut to a standard size, used for recording and storing small amounts of discrete data. Special divider cards with protruding tabs and a variety of cases and trays to hold the cards are also sold by stationers and office product companies. Using cards to create an index was the brainchild of 18th-century naturalist Carl Linnaeus , who is known as "the father of modern taxonomy" for his work on categorizing species. Gather more than you need. If you are not organized, it will take considerably more time to write the paper.
With this method, you categorize the information you find by topic. A collection of such cards either serves as, or aids the creation of, an index for expedited lookup of information such as a library catalog or a back-of-the-book index. You will be less likely to write down unnecessary information facts that are not related to your topic if you are careful to write down the topic for every card. For each note you will need to record author's name, the title of reference book, article, interview, etc.
Also, consider color coding your cards by topic to keep your paper organized from the start. This way related ideas from different sources can be easily grouped together or rearranged. Other sizes widely available include 4 by 6 inches For information on citing your sources, look at English Works! If every topic directly supports your thesis statement, then each topic pile should become a supporting idea, body paragraph, or part of a paragraph in your paper. This system was invented by Carl Linnaeus ,  around
If you don't cite a source, you are guilty of plagiarism! You can have any number of piles and any number of cards in each pile.