Rüdiger Köppe Verlag, Köln - A Grammatical Description of Metta (Cameroon) in Relation to Focus Parametric Variation, ISBN: 978-3-89645-544-4

http://wayback.archive.org/web/20071004230245/http://www.koeppe.de/katalog/katalog_detail.php?ISBN=978-3-89645-544-4

Rüdiger Köppe Verlag, Köln - A Grammatical Description of Metta (Cameroon) in Relation to Focus Parametric Variation, ISBN: 978-3-89645-544-4