First there was Strunk's "Elements of Style", then came Kurt Vonnegut.
For a discussion of literary style in a narrower sense, in a more technical sense, I recommend to your attention The Elements of Style, by William Strunk, Jr. and E.B. White. E.B. White is, of course, one of the most admirable literary stylists this country has so far produced.
You should realize, too, that no one would care how well or badly Mr. White expressed himself, if he did not have perfectly enchanting things to say.