Do you have tips on literature on writing skills? Here is an excerpt from The Art of Nonfiction by Ayn Rand. The book is edited by Robert Mayhew.
The articles I most enjoy writing are in the middle range. Middle-range articles fall somewhere between theoretical and journalistic articles. They consist of the application of abstractions to concretes, which is what most intellectual magazines contain. Such articles deal neither with philosophical theory nor with concrete reporting. They accept a theoretical proposition and analyze some current event or some aspect of the culture from that viewpoint. (Chapter 1 - Preliminary Remarks, page 5.)
Recommended reading: Gus Van Horn Turns Three!