Unfortunately, I was not able to find any books on human psychology written by August Strindberg, however,  I can provide a list of August Strindberg's best selling books, ranked by popularity:

1. The Son of a Servant
2. The Red Room
3. Hemsoborna
4. By the Open Sea
5. Miss Julie
6. The Father

Source: https://thegreatestbooks.org/authors/6252
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