1👍
I finally found a django ticket that solved my problem.
# conf.py
intersphinx_mapping = {
'django': ('http://docs.djangoproject.com/en/1.9/',
'http://docs.djangoproject.com/en/1.9/_objects/'),
}
How ever, it would be nice if someone can add how to cross-reference titles in different docs using sphinx.
Source:stackexchange.com