Gaya APA
DROOYAN, I. et al
(1967).
TRIGONOMETRI: AN ANALYTIC APPROACH
(
4th)
.
London:
COLLIER MACMILLAN.
Gaya MLA
DROOYAN, Irving.. et al.
"TRIGONOMETRI: AN ANALYTIC APPROACH".
4th
London:
COLLIER MACMILLAN,
1967.
Textbook.