BILDNACHWEISE: Rubrikenheader: © naka – stock.adobe.com, #278087388 (2019) | Zur Suche: BSB / H.-R. Schulz; Science Photo Library, http://quest.eb.com/search/132_1310895/ | Titel beitragen: © PantherMedia / Leung Cho Pan, #17205808 (2019) | Über das Projekt: © pixelrobot – stock.adobe.com, #74457318 (2019) | Neu aufgenommene Titel: © Mihai Simonia – stock.adobe.com, #46239172 (2019) | Profil: © Africa Studio – stock.adobe.com, #109591004 (2019) | Weitere Fachbibliografien: © olegkruglyak3 – stock.adobe.com, #77633649 (2019) | Redaktion: © Тихон Купревич – stock.adobe.com, #267619441 (2019)