Tikhonov, Andrey N., author
John Wiley & Sons, 1977
Buku Teks
Manila: Summer Inst. of Linguistics, 1955
Buku Teks
Robertson, John A., author
Bantam Books, 1983
Buku Teks
Barry, Patricia D.
Lippincott , 1984
Buku Teks
Bartol, Curt R., author
Pearson Education, Inc., 2008
Buku Teks