Gaya APA
FEHR, H, F., PHILLIPS, J, M. (1967).
Teaching modern mathematics in the elementary school .
Reading, Massachusetts:
Addison-Wesle.
Gaya MLA
FEHR, Howard, F.., PHILLIPS, Jo, McKeeby.
"Teaching modern mathematics in the elementary school".
Reading, Massachusetts:
Addison-Wesle,
1967.
Buku.