- Author: John U. Wolff, Laurent Sagart
- Language: English
- Year: 2018
- Author: John U. Wolff, Laurent Sagart
- Language: English
- Year: 2018
- Author: John U. Wolff
- Language: English
- Year: 2018
- Author: John U. Wolff
- Language: Indonesian
- Year: 2018
- Author: John U. Wolff
- Language: English
- Year: 2018
- Author: John U. Wolff Soepomo Poedjosoedarmo
- Language: English
- Year: 1982
- Author: John U. Wolff
- Language: Cebuano-English
- Year: 1972
- Author: John U. Wolff
- Language: Cebuano-English
- Year: 1972
- Author: John U. Wolff
- Language: English
- Year: 1966
Ratahan
pdf
- Author: Nikolaus P. Himmelmann & John U. Wolff
- Language: German
- Year: 1999