Reisen in Ost-afrika: Ausgeführt in den Jahren 1837-1855

Nika-English Dictionary

Vocabulary of the Galla Language

A Dictionary of the Suahili Language

Travels, Researches, and Missionary Labours, during an Eighteen Years' Residence in Eastern Africa

Outline of the Elements of the Kisuáheli Language

Meine Größere Reisen in Ostafrika, Zweiter Theil

Reisen in Ost-Afrika