Herbarium Blackwellianum emendatum et auctum, id est, Elisabethae Blackwell collectio stirpium.
Norimbergae : Typis Io. Iosephi Fleischmanni, 1750-1773..
biodiversitylibrary.org/page/291513
Description: English: Knautia arvensis in commune of Montriond, Haute-Savoie, France. Date: 18 June 2020, 13:12:57. Source: Own work. Author: Krzysztof Golik (1987–) . . Description: Polish Wikimedian and photographerFree-license photographer. Date of birth: 16 April 1987 . Location of birth: Świecie. Authority control: : Q51955005. creator QS:P170,Q51955005. Camera location46° 12′ 24.21″ N, 6° 43′ 01.57″ EView all coordinates using: OpenStreetMap 46.206725; 6.717103.