(1968). About the Sudbury Valley School. Sudbury Valley School.
Chicago-Zitierstil (17. Ausg.)About the Sudbury Valley School. [Framingham]: Sudbury Valley School, 1968.
MLA-Zitierstil (8. Ausg.)About the Sudbury Valley School. Sudbury Valley School, 1968.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.