@book {9783830988861, 
	title = "Challenging Life: Existential Questions as a Resource for Education",
	isbn = "9783830988861",
	url = "http://www.content-select.com/index.php?id=bib_view&ean=9783830988861",
	url = "https://content-select.com/de/portal/media/view/5c868578-6f1c-4e48-8c03-2fb3b0dd2d03",
	publisher = "Waxmann Verlag",
}