Submitters
- A critical look at the Submitters, followers of the late Rashad Khalifa, who claimed to be a Messenger of Allah.
- http://www.islamawareness.net/Deviant/Submitters/

The Khalifites (19ers)
- Critical articles from mainstream Islamic viewpoint. Asserts that Submitters are not considered Muslims.
- http://islamicweb.com/beliefs/cults/submit.htm

A Miracle or a Deception?
- Debate over the alleged Code 19 in the Quran.
- http://mostmerciful.com/miracle-or-deceit.htm

Are there Mathematical Miracles in the Quran or the Bible?
- Christian response to claims of mathematical codes in the Quran and the Bible.
- http://answering-islam.org.uk/Religions/Numerics/

The Code 19 Deceit
- Collection of articles and excerpts from numerous debates between Quran students about the beliefs of the Submitters.
- http://www.inet.ba/~hardy/code_19.htm

The Mysterious 19 In The Qur'an - A Critical Evaluation
- Christian analysis of Dr. Khalifa's Quran translation and interpretation.
- http://answering-islam.org/Nehls/Ask/number19.html