Cita APA (7a ed.)

Freudenthal, H. (1973). Mathematics as an educational task. Reidel.

Cita Chicago Style (17a ed.)

Freudenthal, Hans. Mathematics as an Educational Task. Dordrecht: Reidel, 1973.

Cita MLA (8a ed.)

Freudenthal, Hans. Mathematics as an Educational Task. Reidel, 1973.