"Summary of the standards and examples of cards: Different types — Secondary notes, classification number, system of classification — Margins — Subject card, assessment card and availability card, standard card — Assessment sheet — Text of standards: for subject cataloguing, for the recording of comments, for classification, for drawing up the standard card." (Jean-Marie Van Bol, Abdelfattah Fakhfakh: The use of mass media in the developing countries. Brussels: CIDESA, 1971 Nr. 1107, topic code 39)