* {{cite book | last=Abbas | first=Abul K. | last2=Lichtman | first2=Andrew H. | title=Cellular and Molecular Immunology | publisher=W B Saunders Company | publication-place=Philadelphia, Pa | date=2005 | isbn=1-4160-2389-5}}
<ref name="o192">{{cite book | last=Abbas | first=Abul K. | last2=Lichtman | first2=Andrew H. | title=Cellular and Molecular Immunology | publisher=W B Saunders Company | publication-place=Philadelphia, Pa | date=2005 | isbn=1-4160-2389-5 | page=}}</ref>