Matteo Ricci. Translated by Timothy Billings: On Friendship: One Hundred Maxims for a Chinese Prince. Columbia University Press 2009, S. 44 (Online) – Siehe auch Yuet Keung Lo: My Second Self: Matteo Ricci's Friendship in China. Monumenta Serica, Vol. 54 (2006), pp. 221-241 - Online
google.de
vgl. Ruixi Zhu et al., S. 361 (Li Zhiyan: 'Findings of Li Donggu – Friends and Old Acquaitances')
Matteo Ricci. Translated by Timothy Billings: On Friendship: One Hundred Maxims for a Chinese Prince. Columbia University Press 2009, S. 44 (Online) – Siehe auch Yuet Keung Lo: My Second Self: Matteo Ricci's Friendship in China. Monumenta Serica, Vol. 54 (2006), pp. 221-241 - Online
jstor.org
Matteo Ricci. Translated by Timothy Billings: On Friendship: One Hundred Maxims for a Chinese Prince. Columbia University Press 2009, S. 44 (Online) – Siehe auch Yuet Keung Lo: My Second Self: Matteo Ricci's Friendship in China. Monumenta Serica, Vol. 54 (2006), pp. 221-241 - Online