How To Write With Style (1999)
This is good advice, but I've seen huge successes by authors and article writers  who violate these rules (the recent trend of long literary fiction such as 'City on Fire', which is 900 pages).  Nowadays, the trend is towards longer, 'epic' fiction with post-modern themes, whereas in Vonnegut's day (along with Heinlein, Asimov etc.) 'short' was better. Up until as recently as the 90's, 'short' was ideal, but all that changed. Look at Harry Potter and other popular books...all very long. It also deepens on the audience and the purpose...if you're trying to convey technical information , fluff is undesirable