Anonymous. 2007. Demographic Information On Sign Languages Around the World: Field Survey Notes. (SIL Electronic Survey Reports 2007-021 \url{http://www.sil.org/silesr/abstract.asp?ref=2007-021}).
@techreport{161311,
author = {Anonymous},
institution = {SIL International, Dallas},
note = {SIL Electronic Survey Reports 2007-021 \url{http://www.sil.org/silesr/abstract.asp?ref=2007-021}},
title = {Demographic Information On Sign Languages Around the World: Field Survey Notes},
year = {2007},
hhtype = {overview},
inlg = {English [eng]},
src = {hh}
}