TY  - BOOK
AU  - Martin,John Henry
AU  - Harrison,Charles Hampton
TI  - Free to learn: unlocking and ungrading American education 
SN  - 0133310663
PY  - 1972///
CY  - Englewood Cliffs, N.J.
PB  - Prentice-Hall
KW  - Education
KW  - United States
N1  - Includes bibliographical references
ER  -