Kirtland, J. (2001). Identification numbers and check digital schems. MAA.
Chicago Edition CitationKirtland, Jeoseph. Identification Numbers and Check Digital Schems. MAA, 2001.
Cita MLAKirtland, Jeoseph. Identification Numbers and Check Digital Schems. MAA, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.