François, Alexandre (2015). The ins and outs of up and down: Disentangling the nine geocentric space systems of Torres and Banks languages. In Alexandre François; Sébastien Lacrampe; Michael Franjieh; Stefan Schnell (eds.). The languages of Vanuatu: Unity and diversity. Studies in the Languages of Island Melanesia. Canberra: Asia-Pacific Linguistics. 137–195. ISBN 978-1-922185-23-5.