Thinking the Unthinkable: Conceptual Breakthrough Science Fiction
Book
Aliens and Alien Societies
by Stanley Schmidt
A thoughtful, clear and utterly fascinating reference, this book is absolutely vital to writers who want to put extraterrestrial life-forms in their novels and stories.
Book
The Science Fiction Encyclopedia
by Peter Nicholls
Nearly two thousand illustrated entries covering science-fiction authors, editors, critics, magazines, anthologies, comics, illustrators, films, filmmakers, and major themes are thoroughly cross-referenced.