Gaya APA
Astuti, I, Y. (2009).
A series of grammar:Let's study adverb (Mempelajari kata keterangan) .
BANDUNG:
Pakaraya.
Gaya MLA
Astuti, Indri, Yuli.
"A series of grammar:Let's study adverb (Mempelajari kata keterangan)".
BANDUNG:
Pakaraya,
2009.
Abdul Gaffar.