Cita APA

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

Citación estilo Chicago

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

Cita MLA

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