[Sparrow]

Hi J, maybe you could give him Justin Mamis', When to sell as a christmas present. It might not be that up to date being written in the 70s, but one of the first chapters is called the neurotic investor.
It describes perfectly how the herd is trading. The book is about investing though, not day trading.

Losing traders should paper trade until they think they have an edge without deluding themselves, everything else is gambling.

Hope it helps a little.