@book {9783966457149, title = "Persönlichkeitsentwicklung: Das große Buch", isbn = "9783966457149", url = "http://www.content-select.com/index.php?id=bib_view&ean=9783966457149", url = "https://content-select.com/de/portal/media/view/62309ae2-3300-4315-ac79-1679b0dd2d03", publisher = "BMU Verlag", }