I have one Backbone model which has an attribute that is a reference to another Backbone model. For example, a Person has a reference to an Address object.
P
Try using Handlebars, a templating engine based on Mustache with nested properties support.
Then it would be as easy as {{Address/City}}.
{{Address/City}}
If you don't want to change your templating engine, you can flatten results from Address object and pass them as properties directly on the Person.
Address
Person