Penn, C. R. (2011). Future perfect? Improving preparedness through the experiences of the influenza A (H1N1) 2009 pandemic. World Health Organization.
استشهاد بنمط شيكاغوPenn, Charles R. Future Perfect? Improving Preparedness Through the Experiences of the Influenza A (H1N1) 2009 Pandemic. World Health Organization, 2011.
MLA استشهادPenn, Charles R. Future Perfect? Improving Preparedness Through the Experiences of the Influenza A (H1N1) 2009 Pandemic. World Health Organization, 2011.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.