Gaya APA
Rogers, C, R.
(1971).
Leren in vrijheid. : Freedom to learn.
.
Haarlem:
De Toorts Harlem.
Gaya MLA
Rogers, Carl, R..
"Leren in vrijheid. : Freedom to learn. ".
Haarlem:
De Toorts Harlem,
1971.
Buku.