Columbia subject headings:
Education--Philosophy--Periodicals.
Korczak, Janusz, 1878-1942--Periodicals.
Harvard subject headings:
Education--Philosophy--Periodicals
Korczak, Janusz, 1878-1942--Periodicals.
Princeton subject headings:
Education--Philosophy--Periodicals.
Korczak, Janusz, 1878-1942--Periodicals.
Periodicals.