  The classical limit for generalized partition functions is obtained using
coherent states. In this framework it is presented a general procedure to
obtain all the corrections to the classical limit. In particular, the first and
second order quantum corrections are worked out explicitly, and the classical
limit for the Tsallis thermostatistics is determined. The results of this work
generalize the ones obtained by E. Wigner (Phys. Rev. 40 (1932) 749) for usual
statistical mechanics.
