1. Reference Samples of Rocks - The Search for “Best Values”;Abbey;Geostandards Newsletter,1979
2. A chemical model for the origin of gibbsite from kaolinite;Gardner;The American Mineralogist,1970
3. Conditions for direct formation of gibbsite from K-feldspar, further discussion;Gardner;The American Mineralogist,1972
4. Yacimiento de Bauxita Ferruginosa, Serranía de Los Guaicas, Estado Bolívar, Informe Final, Ministerio de Energía y Minas;Ascanio;República de Venezuela,1979