Crisis stabilization units offer law enforcement officers and mobile crisis teams a safe place to bring people in behavioral health crisis, often in lieu of arrest or emergency hospitalization. However, they can be challenging to establish without the appropriate funding and support from key partners needed to operate the units effectively. Creating buy-in among referral sources, is one important component of achieving this support needed. This brief offers crisis stabilization unit leaders three best practices for collaborating with referral sources to ensure its success.