BOWER, John and Caroline "The dog owner"s problem-solver" 1988. Andromeda Oxford Limited. Montreal : Reader's Digest Association Inc.
" Citronella collars are certainly a more humane alternative than electric antibark collars, which should never be used. They release citronella whenever the dog barks - dogs hate the smell, so if they learn to associate it with barking, they will stop. The collars are most efective for excitable barking " p. 140
