Não informado. (1969). Eric news. Eric Clearinghouse on Teacher Education.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Eric News. Washington: Eric Clearinghouse on Teacher Education, 1969.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Eric News. Eric Clearinghouse on Teacher Education, 1969.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.