Niggli, Urs and Niggli, Idda. 2008. Grammaire Élémentaire du Kassem. Ouagadougou: Summer Institute of Linguistics.
@book{sinnemakizeromarking-Niggli2008,
address = {Ouagadougou},
author = {Niggli, Urs and Niggli, Idda},
publisher = {Summer Institute of Linguistics},
title = {Grammaire Élémentaire du Kassem},
year = {2008}
}