Department of Health (2008) 
Towards a framework for post-registration nursing careers: a national consultation. 
Department of Health: London. 
Available here

Gerrish K (1999)
Teamwork in primary care: an evaluation of the contribution of integrated nursing teams. 
Health and Social Care in the Community 7 (5), 367-375.

Gerrish K (2001) 
A pluralistic evaluation of nursing/practice development units. 
Journal of Clinical Nursing 10, 109 - 118.

Smith G, Cantley C (1985) 
Assessing health care: a study in organisational evaluation.  
Open University Press, Milton Keynes.

Stake R (1995) 
The Art of Case Study Research. 
Thousand Oaks, Sage.

Other resources

International Council of Nurses (ICN) Nurse Practitioner/Advanced Practice Nursing Network
See here

Royal College of Nursing (2012) RCN Competences: Advanced Nurse Practitioners.
An RCN guide to advanced nursing practice, advanced nurse practitioners and programme accreditations. 
Available to download here