Gaya APA
AMMON, U, [., HELLINGER, M, [.
(1991).
Status change of languages
.
New York:
de Gruyter.
Gaya MLA
AMMON, Ulrich, [ed.]., HELLINGER, Marlis, [ed.].
"Status change of languages".
New York:
de Gruyter,
1991.
Buku.