APA (7th ed.) Citation

Science Fiction Writers of America & Science Fiction and Fantasy Writers of America. Directory. Science Fiction Writers of America.

Chicago Style (17th ed.) Citation

Science Fiction Writers of America and Science Fiction and Fantasy Writers of America. Directory. [Place of publication not identified]: Science Fiction Writers of America.

MLA (9th ed.) Citation

Science Fiction Writers of America and Science Fiction and Fantasy Writers of America. Directory. Science Fiction Writers of America.