@inbook{1114071146,
author={David G. Gardner and Dolores Shoback},
title={Prefacio},
booktitle={Greenspan. Endocrinología básica y clínica, 9e},
publisher={McGraw-Hill Education},
address={New York, NY},
year={2012},
url={accessmedicina.mhmedical.com/content.aspx?aid=1114071146}
}