Gaya APA
Widdap, B., 2017-02-10, .
().
380120515
(
Textbook)
.
500:
2017-02-10.
Gaya MLA
Widdap, Brian., 2017-02-10, .
"380120515".
Textbook
500:
2017-02-10,
.
572.3 POE d.