Gaya APA
CLARKSON, D, R., Hansen, R, S. (1964).
UNDERSTANDING TODAY'S MATHEMATICS (Revised Edition).
Hamden:
The Shoe Sring.
Gaya MLA
CLARKSON, Donald, R.., Hansen, Robert, S..
"UNDERSTANDING TODAY'S MATHEMATICS".
Revised Edition
Hamden:
The Shoe Sring,
1964.
Textbook.