Gaya APA
Sibbet, D., 2016-12-13, .
().
207150415
(
Textbook)
.
600:
2016-12-13.
Gaya MLA
Sibbet, David., 2016-12-13, .
"207150415".
Textbook
600:
2016-12-13,
.
650 CAH t.