@InCollection{Olczak:2007,
author
=
"A.Olczak",
title
=
"Umowa w wychowaniu",
pages
=
"949--953",
year
=
"2007",
booktitle
=
"Encyklopedia pedagogiczna XXI wiekuT. 6 : Su - U ISBN: 9788389501776",
publisher
=
"Wydaw. Akademickie "Żak"",
address
=
"Warszawa",
}