Maas, O. (1938). Franciscans in the Middle Kingdom: A survey of Franciscan missions in China from the Middle Ages to the present time. Collectanea Commiss. Synodal..
Chicago-viite (17. p.)Maas, Otto. Franciscans in the Middle Kingdom: A Survey of Franciscan Missions in China from the Middle Ages to the Present Time. Peking: Collectanea Commiss. Synodal., 1938.
MLA-viite (8. p.)Maas, Otto. Franciscans in the Middle Kingdom: A Survey of Franciscan Missions in China from the Middle Ages to the Present Time. Collectanea Commiss. Synodal., 1938.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.