Another two books of Alexander Sutherland Neill:
1-"Freedom - Not License!" - this is actually the continuing of Summerhill book, and it continues with questions and answers, that is: Neill answers on questions from letters he got from different people all over the world.
2-"Neill! Neill! Orange Peel!" - this is the autobiograpihcal book of Neill.

Main Neill's work "Summerhill - A Radical Approach To Child Rearing" may be found here: 
http://thepiratebay.ee/torrent/8459731/Summerhill_-_A_Radical_Approach_To_Child_Rearing_%28english__hindi

Additional books:
Dominie books: 
http://thepiratebay.ee/torrent/8473544/Alexander_Sutherland_Neill_-_Dominie_Books_%28english__odt%29