@inbook{ca1d41ee66f0401eabab5a1529fc734e,
title = "Vader van de middenschool: Leon van Gelder (1913-1981)",
keywords = "Onderwijskunde, Onderwijsgeschiedenis, Biografie, Leon van Gelder",
author = "Amsing, {Hilda T. A.}",
year = "2016",
language = "Dutch",
isbn = "978-90-351-4048-6 (paperback)",
series = "Pioniers van de Nederlandse gedragswetenschappen",
publisher = "Prometheus Bert Bakker",
pages = "242--282",
editor = "Vittorio Busato and {van Essen}, Mineke and Willem Koops",
booktitle = "Zeven grondleggers van de onderwijskunde",
}