Barr, M., & Wells, C. (1985). Toposes,triples and theories. Springer-Verlag.
Čikaški stil citiranjaBarr, Michael, i Charles Wells. Toposes,triples and Theories. New York: Springer-Verlag, 1985.
MLA način citiranjaBarr, Michael, i Charles Wells. Toposes,triples and Theories. Springer-Verlag, 1985.
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