Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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