Cita APA (7th ed.)
Ritzenthaler, R. E. (1963). The effigy Mound-Builders in Wisconsin.
Cita Chicago (17th ed.)
Ritzenthaler, Robert Eugene. The Effigy Mound-Builders in Wisconsin. 1963.
Cita MLA (9th ed.)
Ritzenthaler, Robert Eugene. The Effigy Mound-Builders in Wisconsin. 1963.
Atenció: Aquestes cites poden no estar 100% correctes.