Dryer, Matthew S. 2005n. Negative morphemes. In WALS, 454-457.
@incollection{dryer2005n,
author = {Dryer, Matthew S},
booktitle = {WALS},
key = {Dryer 2005n},
pages = {454-457},
title = {Negative morphemes},
year = {2005n}
}