APA (7th ed.) Citation

National Council of Teachers of Mathematics, U.S.A. (1970). Geometría informal. Trillas.

Chicago Style (17th ed.) Citation

National Council of Teachers of Mathematics, U.S.A. Geometría Informal. Ciudad de México: Trillas, 1970.

MLA (9th ed.) Citation

National Council of Teachers of Mathematics, U.S.A. Geometría Informal. Trillas, 1970.

Warning: These citations may not always be 100% accurate.