@book { GrundlagenKreativeFotografie, title = "Grundlagen Kreative Fotografie", author = "Peter {Uhl} and Martina {Walther-Uhl} and {Fotoschule des Sehens}", year = "2015", publisher = "humboldt", address = "Hannover, Germany", url = "https://schluetersche.openpublishing.com/document/403183" }