APA Style
Tambunan, A, R, S. (2020).
Academic Writing : A Guide For Beginners .
Sumatera Utara:
Pubishing Format.
MLA Style
Tambunan, Anna, Riana, Suryanti.
"Academic Writing : A Guide For Beginners".
Sumatera Utara:
Pubishing Format,
2020.
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