Manila: Summer Inst. of Linguistics, 1955
Buku Teks
Lepsius, Richard
Amsterdam John Benjamins B.V. 1981
Buku Teks
Lammers, Joseph
Paderborn Ferdinand Schoning 1955
Buku Teks
Honnor, Sylvia, author
Leeds E.J. Arnold 1985,
Buku Teks
London English University Press 1958
Buku Teks