Iready understand technical texts

The phrase, "the longest journey begins with a single step" means

What is wong with this sentence cameron, who has an extreme and unreasonable suspicion of other people and their motives, suffers from paranoia which is a psychological disorder characterized by delusions of persecution or grandeur, was absolutely sure that someone was following him even though he was absolutely alone and hadn't seen a car for miles and miles.

Which of these websites would be least likely to provide credible reference material for researching stress?