@inbook{57092620,
author={Douglas F. Paulsen},
title={Chapter 4. Epithelial Tissue},
booktitle={Histology & Cell Biology: Examination & Board Review, 5e},
publisher={The McGraw-Hill Companies},
address={New York, NY},
year={2010},
url={accessmedicine.mhmedical.com/content.aspx?aid=57092620}
}