(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.
警告：这些引文格式不一定是100％准确.