APA

Centers for Disease Control and Prevention (U.S.), . (2011). Your child at 2 years =: su hijo de 2 anos. [Atlanta, GA]: Department of Health and Human Services, Centers for Disease Control and Prevention.

Chicago

Centers for Disease Control and Prevention (U.S.), . 2011. Your child at 2 years =: su hijo de 2 anos. [Atlanta, GA]: Department of Health and Human Services, Centers for Disease Control and Prevention.

Harvard

Centers for Disease Control and Prevention (U.S.), . (2011). Your child at 2 years =: su hijo de 2 anos. [Atlanta, GA]: Department of Health and Human Services, Centers for Disease Control and Prevention.

MLA

Centers for Disease Control and Prevention (U.S.), . Your child at 2 years =: su hijo de 2 anos. [Atlanta, GA]: Department of Health and Human Services, Centers for Disease Control and Prevention. 2011.