Let $M$ be a commutative monoid. Define the bar construction $BM$ as the thin geometric realization of $[p] \mapsto M^p$. I am looking for a reference for the fact that $BM$ is again a commutative monoid.
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4$\begingroup$ Graeme Segal. Cohomology of topological groups. In Symposia Mathematica, Vol. IV (INDAM, Rome, 1968/69), pages 377–387. Academic Press, London, 1970. $\endgroup$– Chris Schommer-PriesCommented May 21 at 19:56
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$\begingroup$ @ChrisSchommer-Pries : This seems to be very hard to find. Do you have a link? $\endgroup$– Ulrich PennigCommented May 22 at 11:55
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$\begingroup$ @UlrichPennig dmitripavlov.org/scans/… $\endgroup$– Dan RamrasCommented May 27 at 20:24
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$\begingroup$ @DanRamras Awesome! Thank you! $\endgroup$– Ulrich PennigCommented May 28 at 15:26
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