These are books I recommend you look at if you are interested in Dialogue, Learning and Social Systems Design. If you decide to buy them, use my links so I get a cup of coffee ;) and please let me know your thoughts about them.

I and Thou.
Buber, Martin; Scribner 1958
Disponível em português: “Eu e Tu” pela Centauro Editora ISBN: 85-88208-16-4

Deschooling society
Ivan Illich; Calder and Boyars 1971
Disponível em português: PDF Online

Summerhill
A. S. Neill; Hart Pub. Co. 1960
Disponível em português: Liberdade sem Mêdo (Summerhill) pela Ibrasa, 1967

I recommend you check the great articles at the encyclopaedia of informal education.