kick step dad out.....
Ha! That was funny! That would be my choice too. I tried a citronella collar on my previous dog Ripley but he was too smart for it....He would bark and it would spray citronella and then he would bark at the citronella and it would spray again and he would bark at it again and so on and so on until the collar was out of citronella!! (Doesn't take long, it only squirted about 15 times per canister)
I would try what Giselle said also. I for one, like the dog barking at a knock or a doorbell. Duncan does the same but he also bum rushes the door and will knock the person down if I open it without restraining him...but that's a whole other story...

Duncan even barks at a doorbell on TV. There are certain commercials I dread!! Like some of the pizza delivery one!!

Good Luck. Don't give up!