@book { ZurProfessionalittpdagogischenHandelns, title = "Zur Professionalität pädagogischen Handelns", author = "Axel {Schmidt}", year = "2001", publisher = "Diplom.de", address = "Hamburg, Deutschland", doi = "10.3239/9783832431181", url = "https://m.diplom.de/document/218824" }