I am trying to apply for humanities (PhD is pure humanities) graduate school in USA next year. I am going to graduate with a bachelor in computer science. The application requires three letters of recommendation, how am I supposed to get those letters of recommendations? We studied zero humanities subjects. I study in Europe.
I suppose that you’re just going to have to work with the letters you have. You should let your letter writers know what the target program is so they can potentially tailor it to the best of their ability.
In any case, the point of the letters is mostly to indicate your research potential. This can definitely be indicated regardless of discipline.