Quantities, Units and Symbols in Physical Chemistry by IUPAC

IUPAC Green Book, third edition(2007), second printing(2012). Official title page identifies IUPAC and publication editors. Section2.11, printed pp.57,59: relative activity $a=\exp [(\mu -{\mu }^{\circ })/(RT)]$ and Raoult-reference activity coefficient; section2.11.1(iv), printed pp.61–62: distinct pure-phase and solute standard states. Activities and their standard chemical potentials must use matching conventions. No individual editor identity inferred from abbreviated bylines.

Section2.11, printed p.58: reaction quotient, standard reaction Gibbs energy and standard equilibrium constant; note18 states that the equilibrium constant is dimensionless and depends on the specified standard state.