Cornel Viljoen is the author of the Nortje/Nortier Family Register. This is a register of the descendants of the brothers Daniel, Jean and Jacques Nortier This register sets new standards for the way in which genealogies can be compiled. All the spelling variations of names and surnames are given, as well as the links to FamilySearch entries for digital copies of sources. There are almost 5000 entries in the register and encompass four volumes. The work is written in English. The price for the set of four books is R1000. Life members of the Society can buy a set at R800 and orders for more than 10 is also R800 per set.