- A Dictionary of the Suahili Language - Primary Source Edition
- Outline of the Elements of the Kisuáheli Languaage,: with special reference to the Kiníka Dialect
- Dictionary of the Kiniassa Language
- Vocabulary of the Galla Language
- Travels, Researches, and Missionary Labors During an Eighteen Years' Residence in Eastern Africa: Together With Journeys to Jagga, Usambara, Ukambani, ... a Coasting Voyage From Mombaz to Cape Delgado