Soul, spirit, fate: according to the notions of the Tshi and Ehwe tribes (Gold Coast and Togo, W. Africa) [annotated and translated from German by A. Jehle]
The "Christian Messenger" and its successors: a description of the first three series of a missionary periodical with articles in Ghanaian languages (Twi and Gã), 1883-1931
Languages of the Akan area: papers in western Kwa linguistics and on the linguistic geography of the area of Ancient Begho (Transactions of the Linguistic Circle of Accra, III)