APA aipamena

Rudoffer, S., & Baker, I. N. (1967). Mathematics observed. Hans Freudenthal.

Chicago Style aipamena

Rudoffer, Stephen, and I N. Baker. Mathematics Observed. London: Hans Freudenthal, 1967.

MLA aipamena

Rudoffer, Stephen, and I N. Baker. Mathematics Observed. Hans Freudenthal, 1967.