@book { VorwortinASNeillSummerhill, title = "Vorwort in A. S. Neill „Summerhill“", subtitle = "Foreword", author = "Erich {Fromm} and Rainer {Funk}", year = "2016", publisher = "Edition Erich Fromm", address = "München, Deutschland", url = "https://books.openpublishing.com/document/313994" }