Παραπομπή σε μορφή APA (7η εκδ.)

MATHEMATICS, N. C. O. T. O. (1963). Enrichment Mathematics for the Grades. National Council of Teachers of Mathematics.

Παραπομπή σε μορφή Chicago (17η εκδ.)

MATHEMATICS, NATIONAL COUNCIL OF TEACHERS OF. Enrichment Mathematics for the Grades. National Council of Teachers of Mathematics, 1963.

Παραπομπή σε μορφή MLA (8th εκδ.)

MATHEMATICS, NATIONAL COUNCIL OF TEACHERS OF. Enrichment Mathematics for the Grades. National Council of Teachers of Mathematics, 1963.