Gaya APA
Nelson, A, L., W., F.
(1956).
Plane trigonometry
(
Ed.3)
.
New York:
Harper \n Brothers.
Gaya MLA
Nelson, Alfred, L., W., Folley,Karl.
"Plane trigonometry".
Ed.3
New York:
Harper \n Brothers,
1956.
Buku Tercetak.