APA

National Council of Teachers of Mathematics, Velasco Coba F. & Lluis Riera E. (1970). El sistema de los numeros reales: national council of teachers of mathematics. México: Editorial Trillas.

Chicago

National Council of Teachers of Mathematics, Velasco Coba Federico and Lluis Riera Emilio. 1970. El sistema de los numeros reales: national council of teachers of mathematics. México: Editorial Trillas.

Harvard

National Council of Teachers of Mathematics, Velasco Coba F. and Lluis Riera E. (1970). El sistema de los numeros reales: national council of teachers of mathematics. México: Editorial Trillas.

MLA

National Council of Teachers of Mathematics, Velasco Coba Federico and Lluis Riera Emilio. El sistema de los numeros reales: national council of teachers of mathematics. México: Editorial Trillas. 1970.