- Modern Swahili Dictionary: Swahili-English, English-Swahili
- Swahili Children's Dictionary: Illustrated Swahili-English, English-Swahili
- Swahili Learner's Dictionary: Swahili-English, English-Swahili
- Modern Yoruba: A Concise Introduction to the Yoruba Language
- Taschenwörterbuch Swahili: Swahili-Deutsch, Deutsch-Swahili