A Selection of the Writing Books on my Shelves
Plotting and Structure
Robert Kernen, Building Better Plots
Jack Bickham, Writing the Short Story
Damon Knight, Creating Short Fiction
Louise Boggess, How to Write Short Stories that Sell
Roland Tobias, Twenty Master Plots and How to Build Them
Writing Speculative Fiction
Writing Science Fiction and Fantasy (Gardner Dozois, et.al, ed.)
Stephen Gillett, World Building
Orson Scott Card, Writing Science Fiction & Fantasy
Stanley Schmidt, Aliens and Alien Societies
Stephen H. Dole, Planets for Man (Not writing related, but wow, talk about a good reference work for SF writers! It's out of print, though, and pretty hard to get.)
Craft
Ursula Le Guin, Steering the Craft
John Gardner, The Art of Fiction
Creating Characters
Orson Scott Card, Characters and Viewpoint
Dwight Swain, Creating Characters