Cita APA (7a ed.)

Whittington, H. B. (1954). Two Silicified Carboniferous Trilobites from West Texas. Smithsonian Institution.

Cita Chicago Style (17a ed.)

Whittington, Harry B. Two Silicified Carboniferous Trilobites from West Texas. Washington, D.C: Smithsonian Institution, 1954.

Cita MLA (9a ed.)

Whittington, Harry B. Two Silicified Carboniferous Trilobites from West Texas. Smithsonian Institution, 1954.