Gaya APA
Klippel, F. (1992).
KEEP TALKING COMMUNICATIVE FLUENCY ACTIVITIES FOR LANGUAGE TEACHING (1).
New York:
Cambridge University Press.
Gaya MLA
Klippel, Friederike.
"KEEP TALKING COMMUNICATIVE FLUENCY ACTIVITIES FOR LANGUAGE TEACHING".
1
New York:
Cambridge University Press,
1992.
Buku Inti.