BELTINGER, Karoline. Hans Emmenegger. «Maltechnik-Notizbuch» und Werkprozess 1901–1905. Heidelberg: arthistoricum.net-ART-Books,2022. DOI: 10.11588/arthistoricum.1054. Disponível em: https://books.ub.uni-heidelberg.de/arthistoricum/catalog/book/1054.. Acesso em: 4 mai. 2024.