Spanagel. DeWitt Clinton and Amos Eaton. Johns Hopkins University Press.
Cita Chicago (17th ed.)Spanagel. DeWitt Clinton and Amos Eaton. Johns Hopkins University Press.
Cita MLA (8th ed.)Spanagel. DeWitt Clinton and Amos Eaton. Johns Hopkins University Press.
Atenció: Aquestes cites poden no estar 100% correctes.