@book {9783816983248, title = "Verkaufspsychologisches Know-How", isbn = "9783816983248", edition = "1", url = "http://www.content-select.com/index.php?id=bib_view&ean=9783816983248", url = "https://content-select.com/de/portal/media/view/5b56fc78-454c-404c-83e2-5d67b0dd2d03", publisher = "expert verlag", }