1. U.S. Food and Drug Administration Center for Biologics Evaluation and Research. Product Approval Information - Licensing Action; 2005. Available at www.fda.gov/cber/approvltr/mpdtave011405L.htm. Accessed April 6, 2008.
2. U.S. Food and Drug Administration Center for Biologics Evaluation and Research. Product Approval Information - Licensing Action; 2005. Available at http://www.fda.gov/cber/approvltr/tdapave061005L.htm. Accessed April 6, 2008.
3. U.S. Food and Drug Administration Center for Biologics Evaluation and Research. Product Approval Information - Licensing Action; 2005. Available at http://www.fda.gov/cber/approvltr/tdapgla050305L.htm. Accessed April 6, 2008.
4. U.S. Food and Drug Administration Center for Biologics Evaluation and Research. Product Approval Information - Licensing Action; 2006. Available at http://www.fda.gov/cber/approvltr/hpvmer060806L.htm. Accessed April 6, 2008.
5. Child and adolescent immunizations: new recommendations, new standards, new opportunities;Kohrt;Pediatrics,2003