By considering all available measurements of the flux density of Cassiopeia A it is concluded that its spectrum obeys a simple power law. Using the fluxes given by this law and the relative intensities of other stars given in all available surveys, the spectra of 31 radio stars are derived. In the majority of cases it is only possible to assume a simple power law, flux density ∝ (frequency) x , and to obtain the spectral index, x , for each source. It is found that the mean spectrum is steeper for extra-galactic sources than for galactic ones, while that of the unidentified sources is steeper still.