APA style includes the journal issue number only if each issue of the journal is paginated individually:

Phelan, J. C. (2005). Geneticization of deviant behavior and
     consequences for stigma: The case of mental illness. Journal of Health
     and Social Behavior, 46(4), 307-322.

Continous pagination:
Phelan, Jo C.  "Geneticization of Deviant Behavior and   
     Consequences for Stigma:  The Case of Mental Illness."  
     Journal of Health and Social Behavior 46.4 (2005):  307-
     22.    

Journal that pages each issue separately:
Coventry, Martha L.  "Care with Dignity:  A Concept      
     Analysis."  Journal of Gerontological Nursing 32.5 (2006):              
     42-48. 

Journal that uses only Issue Numbers:
Innes, Martin.  Policing Uncertainty:  Countering Terror 
     through Community Intelligence and Democratic Policing."
     The Annals of the American Academy of Political and
     Social Science.  605 (2006):  222-41.

Continuous pagination:
Mitchell, Anne Marie and Cynthia M. Bulik.  "Eating Disorders and          
     Women's Health:  An Update." Journal of Midwifery and Women's
     Health 51.3 (2006): 193-201.
 

Schrag, Annette, Marjan Jahanshahi, and Niall Quinn.  "What contributes
     to Quality of Life in Patients with Parkinson's Disease?"  Journal of 
     Neurology, Neurosurgery, and Psychiatry 69 (2000).  16 May 2006.
     http://jnnp.bmjjournals.com/cgi/reprint/69/3/308

Hoek, J. "Advertising and Obesity:  A Behavioral Perspective." Journal of
     Health Communication 11.4 (2006): 409-423. Academic Search
     Premier. LCCC Library, Elyria.  21 June 2006
     <http://search.ebscohost.com>