APA

National Center for Immunization and Respiratory Diseases (U.S.), . (2011). 2010-2011 influenza (flu) season: questions & answers. Atlanta, GA: Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases.

Chicago

National Center for Immunization and Respiratory Diseases (U.S.), . 2011. 2010-2011 influenza (flu) season: questions & answers. Atlanta, GA: Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases.

Harvard

National Center for Immunization and Respiratory Diseases (U.S.), . (2011). 2010-2011 influenza (flu) season: questions & answers. Atlanta, GA: Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases.

MLA

National Center for Immunization and Respiratory Diseases (U.S.), . 2010-2011 influenza (flu) season: questions & answers. Atlanta, GA: Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases. 2011.