Παραπομπή σε μορφή APA (7η εκδ.)

Walter, M. I. (1970). Boxes, squares and other things: A teacher's guide for a unit in informal geometry. National Council of Teachers of Mathematics.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Walter, Marion I. Boxes, Squares and Other Things: A Teacher's Guide for a Unit in Informal Geometry. Virginia: National Council of Teachers of Mathematics, 1970.

Παραπομπή σε μορφή MLA (8th εκδ.)

Walter, Marion I. Boxes, Squares and Other Things: A Teacher's Guide for a Unit in Informal Geometry. National Council of Teachers of Mathematics, 1970.