Autoform selection from referenced collection ( Simple-Schema, Collection2, Autoform )

I’m trying to figure out how to create a schema, and form so that when I enter the form, the referenced field appears as a drop-down of possible choices. For instance if I have a Collection called Manufacturer, and on called Car, with the Car having Manufacturer as a field, I would like this to appear in the Autoform as a dropdown, but currently it does not have this behavior.