I invite you to visit online lectures on socionics that I (together with my wife) actually conduct in English for Bulgarian psychologists:
Just ignore the topics titled in Bulgarian, and read numbered topics titled in English. The lectures will last 1-2 more weeks, we are going to upload 6-7 more topics (4 are already uploaded).
Although their forum is closed for new visitors, you can watch and then comment here. It is probably the first attempt to explain socionics in terms understandable for non-Russian audience, because Russian books on socionics are filled with Russian stereotypes and sometimes make Western readers confused.
We also performed detailed comparison between socionics and Myers-Briggs typology, their similarity and their difference (in fact, we have to consider the difference in each topic).