The following recommended literature, arranged according to subject, represents a thoughtful selection. It is intended to enable the reader to carry out an in-depth examination of the subject matter, and the reasoning behind the suggestions provided by this book. The works have been selected from the viewpoint of their importance and topicality. Of course, the list may also include works that do not necessarily reflect the views of the author. For the purposes of clarification, “help in defining a term” is given priority over “supporting the accuracy of the viewpoint.”