Chase, Stephen. A Treatise on Algebra. G. S. Appleton, 65. o. (1849). Hozzáférés ideje: 2007. október 1.
For example, a 1980 Maryland law specifies, "(a) On even numbered calendar dates gasoline shall only be purchased by operators of vehicles bearing personalized registration plates containing no numbers and registration plates with the last digit ending in an even number. This shall not include ham radio operator plates. Zero is an even number; (b) On odd numbered calendar dates …" Partial quotation taken from Google book search, accessed on 2008-02-22.
Conner, P. E. and E. E. Floyd (1960). „Fixed point free involutions and equivariant maps”. Bulletin of the American Mathematical Society60 (6), 416–441. o. DOI:10.1090/S0002-9904-1960-10492-2.
Dickerson, David (2006). „Aspects of preservice teachers' understandings of the purposes of mathematical proof”. Alatorre, S., Cortina, J.L., Sáiz, M., and Méndez, A.(Eds) Proceedings of the 28th Annual Meeting of the International Group for the Psychology of Mathematics Education: 710-716, Mérida, Mexico: Universidad Pedagógica Nacional. [2011. július 27-i dátummal az eredetiből archiválva]. Hozzáférés: 2009. október 24.
Dickerson, David (2006). „Aspects of preservice teachers' understandings of the purposes of mathematical proof”. Alatorre, S., Cortina, J.L., Sáiz, M., and Méndez, A.(Eds) Proceedings of the 28th Annual Meeting of the International Group for the Psychology of Mathematics Education: 710-716, Mérida, Mexico: Universidad Pedagógica Nacional. [2011. július 27-i dátummal az eredetiből archiválva]. Hozzáférés: 2009. október 24.