This must be an older one---You'll need a medium sized flat screw driver--
Look at the knob on the lock side----on the stem about where it meets the escutcheon you should see a small rectangular hole--that's the knob release button--push that with your screwdriver and the knob will pull off.
Next pry off the escutcheon cover with a screwdriver----there are the screws.
There are other variates of this same idea --post a picture if this doesn't work----tell us if it does--Mike--
New members: Adding your location to your profile helps in many ways.--M--