http://www.target.com/Science-Fiction-Fantasy-Literature-Books/b?ie=UTF8&node=332928011

http://en.wikipedia.org/wiki/Science_fiction

http://www.barnesandnoble.com/subjects/scifi/index.asp

http://www.sfsite.com/fsf/

http://www.sfwa.org/

http://en.wikipedia.org/wiki/The_Magazine_of_Fantasy_&_Science_Fiction

http://www.scienceandfantasyfiction.com/index.htm

http://www.deepdiscount.com/Science-Fiction-Fantasy_stcVVcatId463633VVviewcat.htm

http://www.zappos.com/n/es/d/722691515/page/1.html

http://www.sfrt.com/