APA (7th ed.) Citation

National Council of Teachers of Mathematics, U.S.A. (1970). Sugerencias para resolver problemas. Trillas.

Chicago Style (17th ed.) Citation

National Council of Teachers of Mathematics, U.S.A. Sugerencias Para Resolver Problemas. Ciudad de México: Trillas, 1970.

MLA (9th ed.) Citation

National Council of Teachers of Mathematics, U.S.A. Sugerencias Para Resolver Problemas. Trillas, 1970.