If there is more than one author, the citation might look like this (Kusnick and Waterstraat, 1996) or like this (Kusnick and others, 1995). If you use a reference more than once, you just insert the ...

THE title of this book and its subtitle, “Researches into the Domain of the Early Sciences, especially from the Period of the Revival of Scholasticism, with Biographical and other Accounts of ...