Kantor Bahasa Provinsi Maluku Utara, 2015
Majalah, Jurnal, Buletin
Alfonso, Anthony, author
Sophia University LL Center of Applied Linguistics, 1980
Buku Teks
Archipelago Press , 1998
Buku Teks
Noriko Takada, author
Macmillan, 1995
Buku Teks
Willis, Dave, author
Cambridge University Press, 2003
Buku Teks