Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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