Per Ahlberg
From International Auxiliary Languages
- Ahlberg, P., Esperanto utan Lärare, Stockholm: 1906.
- Ahlberg, P. [ed.], Novial, Elementes gramatikali de li lingue international, Stockholm: P. Ahlberg, 1933.
- Ahlberg, P. [ed.], Novialiste, Stockholm: P. Ahlberg, 1934-1939.
