Final answer:
To include a new procedure in LPNs' practice, the manager should refer to the state nurse practice act (NPA), which legally defines the scope of practice within the state.
Step-by-step explanation:
If a manager wants to include a new procedure in the LPNs' (Licensed Practical Nurses) practice, the appropriate source to contact is the state nurse practice act (NPA). The NPA outlines the scope of practice for nurses within the state and would be the legal authority on allowing or disallowing a new procedure in nurses' practice. Facility policies can build upon these but cannot go beyond the state's scope of practice. While the American Nurses Association (ANA) and the National League of Nursing (NLN) may provide valuable guidelines and educational resources, they do not have the legal authority to define or change the scope of practice for nurses. Finally, while the facility policies and procedures committee can develop internal guidelines, they still must align with the NPA.