Du Plessis, J. (2012). The definitive guide to point and figure: A comprehensive guide to the theory and practical use of the point and figure charting method (2nd ed.). Harriman House.
Chicago-Zitierstil (17. Ausg.)Du Plessis, Jeremy. The Definitive Guide to Point and Figure: A Comprehensive Guide to the Theory and Practical Use of the Point and Figure Charting Method. 2nd ed. Petersfield, Hampshire: Harriman House, 2012.
MLA-Zitierstil (9. Ausg.)Du Plessis, Jeremy. The Definitive Guide to Point and Figure: A Comprehensive Guide to the Theory and Practical Use of the Point and Figure Charting Method. 2nd ed. Harriman House, 2012.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.