First, a short personal note to make you understand why this is important to me. To make a long story short, the son of a friend has some atypical form of autism and language troubles. And that kid matters a lot to me, so I want to become stronger in helping him, to be able to better interact with him and help him overcome his troubles.
But I don't know much about psychology. I'm a computer scientist, with a general background of maths and physics. I'm kind of a nerd, social skills aren't my strength. I did read some of the basic books advised on Less Wrong, like Cialdini, Wright or Wiseman, but those just give me a very small background on which to build.
And psychology in general, autism/language troubles in particular, are fields in which there is a lot of pseudo-science. I'm very sceptical of Freud and psychoanalysis, for example, which I consider (but maybe I am wrong?) to be more like alchemy than like chemistry. There are a lot of mysticism and sect-like gurus related to autism, too.
So I'm bit unsure on how from my position of having a general scientific and rationality background I can dive into a completely unrelated field. Research papers are probably above my current level in psychology, so I think books (textbooks or popular science) are the way to go. But how to find which books on the hundreds that were written on the topic I should buy and read? Books that are evidence-based science, not pseudo-science, I mean. What is a general method to select which books to start in a field you don't really know? I would welcome any advise from the community.
Disclaimer: this is a personal "call for help", but since I think the answers/advices may matter outside my own personal case, I hope you don't mind.
To the best of my knowledge (and I've looked) there is not a single scientific long-term randomized study showing the effectiveness of any type of treatment for autism. This means that when deciding on the best way to help the kid you are going to have to rely on the judgment and intuition of family, friends and special needs specialists. Besides the normal biases the huge problem with doing this is that as an autistic child gets older you would expect him, in an absolute sense, to make improvements in many metrics (just as typical kids do) even if whatever special stuff was being done for him had absolutely no impact on his condition. Another problem is that, based on my observations at least, the women who devote their careers to the needs of "special children" tend to be of the very happy/uplifting/optimistic types which undoubtedly causes them to have a more positive assessment of treatment than should be justified and this bias outlook negatively impacts the research that makes use of the subjective judgments of autistic professionals.
Rather than spending time reading about autism you can probably better help this child by playing with him and doing stuff for his parents so they have more time to play with him, although ignore this advice if you enjoy reading about autism and so your doing so isn't a cost.
This is very good advice.