Olson, Clif. 1988. Gumawana Grammar Essentials. (unpublished).
@unpublished{Olson-1988,
author = {Olson, Clif},
title = {Gumawana Grammar Essentials},
type = {manuscript},
year = {1988},
iso_code = {gvs},
olac_field = {morphology; semantics; typology; general_linguistics; syntax},
wals_code = {gmw}
}