APA
Phillip T .Hagen, . (2001). Mayo Clinic. United States of America: Mayo Foundation for Medical Education and Research.
Chicago
Phillip T .Hagen, . 2001. Mayo Clinic. United States of America: Mayo Foundation for Medical Education and Research.
Harvard
Phillip T .Hagen, . (2001). Mayo Clinic. United States of America: Mayo Foundation for Medical Education and Research.
MLA
Phillip T .Hagen, . Mayo Clinic. United States of America: Mayo Foundation for Medical Education and Research. 2001.