Usup, Hunggu Tadjuddin. 1986. Rekonstruksi proto-bahasa Gorontalo-Mongondow. Jakarta: Universitas Indonesia dissertation.
@phdthesis{363,
address = {Jakarta},
author = {Usup, Hunggu Tadjuddin},
school = {Universitas Indonesia},
title = {Rekonstruksi proto-bahasa Gorontalo-Mongondow},
year = {1986}
}