Outline of secondary sources Among all types of cards, the most common, they are also the most necessary these are note cards. They contain a short summary, key points for quoting are written out, your opinion on the book is summarized, and your parallel ideas and ideas for a possible comparison ofthis material with material from other sources are summarized. Thus, the outline of the card is very different from the bibliographic card described insection III.2.2. Bibliographic gives only information for finding the source, and the abstract map is a concentrated knowledge of the source and, therefore, should be much larger. Use large boxes, approximately a notepad page or a sheet of paper. Well, if it is just cardboard, in any case, dense sheets that can be inserted into a box or stacked, dragging with an elastic band.