In-text citations
The American Diabetes Association estimates that the cost of diagnosed diabetes in the United States in 2012 was $245 billion.
The cost of diagnosed diabetes in the United States in 2012 was estimated at $245 billion (Amer. Diabetes Assn.).
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Works cited entry
American Diabetes Association. "Statistics about Diabetes." American Diabetes Association, 1 Apr. 2016, www.diabetes.org/diabetes-basics/statistics.
Directory to MLA in-text citation models
Government agency as author