1. All Wales Nurse Manpower Planning Committee (Midwifery Sub-group) 1985 Standards of care. HMSO, London
2. Audit Commission 1991 The virtue of patients: making the best use of ward nursing resources. HMSO, London
3. Auld M 1976 How many nurses? A method of estimating the requisite nursing establishment for a hospital. RCN, London
4. Ball J A, Goldstone L A, Collier M 1984 Criteria for care: the manual of the North West nurse staffing levels project. Newcastle Polytechnic Products Ltd, Newcastle upon Tyne
5. Ball J A, Oreschnik R 1986a Criteria for care. Senior Nurse 5 (4): 26–9