Gaya APA
Harahap, Y., 2017-09-12, .
().
1206150917
(
Textbook)
.
600:
2017-09-12.
Gaya MLA
Harahap, Yahdiana., 2017-09-12, .
"1206150917".
Textbook
600:
2017-09-12,
.
615.32 Wid o.