Crystal Oscillator:
The frequency of a crystal oscillator is determined by the crystal parameters, load capacitance and implementation. The capacitors across the crystal should match the load capactiance, the parasitic should be taken into account whenever done. Wenzel Associates have a good library on these things.
LC oscillator:
Give information about the implementation that is giving the problem.
PLL:
Check the VCO implementation, reference oscillator frequency, steady loop output.