[diego_moita]

> School textbooks also have

For me the keyword in your comment is "also". What this word means to me is that, whatever faults textbooks might have, there is no alternative solution. They replicate a problem that all books have.

However, within the domain of textbooks, you still might find good solutions for these bias. These bias are mostly within history and social sciences and good and reputable Universities are renowned for publishing books in these domains that are quite balanced, comprehensive, deep and rigorous. Oxford and Cambridge are the 2 best examples that come to my mind. The U.S. has good Universities too, but after their government declared a war on science and knowledge I'd be carefull before trusting these universities.