Foreman, Velma. 1974. Grammar of Yessan-Mayo. (Language Data, Asian-Pacific Series, 4.) SIL.
@book{nicholsdiversity-Foreman1974, author = {Foreman, Velma}, publisher = {SIL}, series = {Language Data, Asian-Pacific Series}, title = {Grammar of Yessan-Mayo}, volume = {4}, year = {1974} }