Full Idea
To most behaviourists it seems misguided to expect there to be a single relation that connects referring expressions with their referents.
Gist of Idea
Behaviourists doubt whether reference is a single type of relation
Source
Robert Kirk (Mind and Body [2003], §5.5)
Book Reference
Kirk,Robert: 'Mind and Body' [Acumen 2003], p.107
A Reaction
You don't need to be a behaviourist to feel this doubt. Think about names of real people, names of fictional people, reference to misunderstood items, or imagined items, or reference in dreams, or to mathematical objects, or negations etc.