Book list:
Free to Learn by Peter Gray
The Happy Child by Steven Harrison
Summerhill by A.S. Neill
What Every Parent Should Know About School by Michael Reist
Free at Last by Daniel Greenberg
How Children Learn by John Holt
How Children Fail by John Holt
Dumbing Us Down: The Hidden Curriculum of Compulsory Schooling by John Gatto
Deschooling Society by Ivan Illich

Schools similar to Maple Hill:
Windsor House School
Alpha Alternative School
Sudbury Valley School
Albany Free School

Online resources:
Unschooling Canada Association
The Seven Sins of Forced Education
Peter Gray’s blog
The Costs of Overemphasizing Achievement
I’m Unschooled. Yes, I can write.
How To Get Into University
School is Hell