Foreman, Velma M. 1974. Grammar of Yessan-Mayo. (Language Data: Asian-Pacific Series, 4.) Ukarumpa: Santa Ana: Summer Institute of Linguistics. iv+304pp.
http://www.sil.org/acpub/repository/10677_front.pdf, http://www.sil.org/acpub/repository/10677.pdf
@book{reesinkgive-80968, address = {Ukarumpa}, author = {Foreman, Velma M.}, number = {4}, pages = {iv+304}, publisher = {Santa Ana: Summer Institute of Linguistics}, series = {Language Data: Asian-Pacific Series}, title = {Grammar of Yessan-Mayo}, url = {http://www.sil.org/acpub/repository/10677_front.pdf, http://www.sil.org/acpub/repository/10677.pdf}, volume = {4}, year = {1974} }