"Quid pro quo": Leisure, Europeans, and their “Skill Capital” in Eighteenth-Century Beijing, in Wagner, Rudolf G. et al. (Hrsg.): Testing the Margins of Leisure: Case Studies on China, Japan, and Indonesia, Heidelberg: Heidelberg University Publishing, 2019 (Heidelberg Studies on Transculturality, Band 6), S. 107–152. https://doi.org/10.17885/heiup.550.c7225