You can use:

```rst
:param: :py:class:`django.forms.Forms`
```

or shorter:


```rst
:param: :class:`django.forms.Forms`
```

Then, if you add Django documentation in intersphinx mappings (see https://github.com/benoitbryon/django-downloadview/blob/master/docs/conf.py#L198 and https://github.com/benoitbryon/django-downloadview/blob/master/docs/conf.py#L198 as examples), you will get links to Django documentation :)