THOMAS, Rick. Sterling College degree program “Sustainable Agriculture and Draft Animal Power Systems”. In: STAATLICHE SCHLÖSSER UND GÄRTEN HESSEN; KROPP, Claus; ZOLL, Lena (Hrsg.). Draft Animals in the Past, Present and Future. Heidelberg: Propylaeum,2022. p. 191–196. DOI: 10.11588/propylaeum.1120.c15615. Disponível em: https://books.ub.uni-heidelberg.de/propylaeum/catalog/book/1120/chapter/15615.. Acesso em: 19 mai. 2024.