To be certain, I recommend:
* Consulting your owner's manual: This is the most reliable source for your specific vehicle.
* Looking at a repair manual specific to your year and engine: A Haynes or Chilton manual will have diagrams showing the PCV valve location.
* Searching online for "1995 Pontiac Bonneville SE PCV valve location": You might find pictures or videos from other owners who have already identified it on their car.
Remember to be careful when working around the engine compartment. Let the engine cool completely before attempting any repairs.