@book { DieKunstdesLiebens, title = "Die Kunst des Liebens", subtitle = "The Art of Loving. An Inquiry into the Nature of Love", author = "Erich {Fromm} and Rainer {Funk}", year = "2014", publisher = "Edition Erich Fromm", address = "München, Deutschland", url = "https://books.openpublishing.com/document/286085" }