Gaya APA
Eicholz, R, E., Martin, E.
(1967).
Elementary school mathematics boo 2
.
Polo Alto:
GunungAgung.
Gaya MLA
Eicholz, Robert, E., Martin, Emerson.
"Elementary school mathematics boo 2".
Polo Alto:
GunungAgung,
1967.
Text.