Gaya APA
a Correlation betwen students' mastery of past tense and their achievement in writing recount. (2011).
Medan:
Universitas HKBP Nommensen.
Gaya MLA
a Correlation betwen students' mastery of past tense and their achievement in writing recount.
.
Medan:
Universitas HKBP Nommensen,
2011.
Artikel.