Gaya APA
Clarkson, D, R., Hansen, R, S. (1964).
Understanding today s mathematics. (1964).
:
Hamden : The Shoe String Press, Inc.,.
Gaya MLA
Clarkson, Donald, R.., Hansen, Robert, S..
"Understanding today s mathematics.".
1964
:
Hamden : The Shoe String Press, Inc.,,
1964.
Text.