Gaya APA
Widiatmoko, P., 2017-09-19, .
().
1236160917
(
Textbook)
.
:
2017-09-19.
Gaya MLA
Widiatmoko, Pratomo., 2017-09-19, .
"1236160917".
Textbook
:
2017-09-19,
.
543.17 SIS k - I - 2.