Gaya APA
Elbaum, S, N., Peman, J, P. (2016).
Grammar in Context Basic, Sixth Edition .
Boston:
NATIONAL GEOGRAPHIC LEARNIN.
Gaya MLA
Elbaum, Sandra, N., Peman, Judith, P.
"Grammar in Context Basic, Sixth Edition".
Boston:
NATIONAL GEOGRAPHIC LEARNIN,
2016.
Text.