Cita APA (7a ed.)

Thomas, C. (1889). The circular, aquare, and octagonal earthworks of Ohio. Govt. print. off..

Cita Chicago Style (17a ed.)

Thomas, Cyrus. The Circular, Aquare, and Octagonal Earthworks of Ohio. Washington: Govt. print. off., 1889.

Cita MLA (9a ed.)

Thomas, Cyrus. The Circular, Aquare, and Octagonal Earthworks of Ohio. Govt. print. off., 1889.