Cita APA (7a ed.)

Perkins, B. F. (1971). TRACE fossils: A field guide to selected localities in Pennsylvanian, permian, cretaceous, and tertiary rocks of Texas and related papers. The School of Geoscience Louisiana State Universit.

Cita Chicago Style (17a ed.)

Perkins, Bob F. TRACE Fossils: A Field Guide to Selected Localities in Pennsylvanian, Permian, Cretaceous, and Tertiary Rocks of Texas and Related Papers. Baton Rouge, La.: The School of Geoscience Louisiana State Universit, 1971.

Cita MLA (8a ed.)

Perkins, Bob F. TRACE Fossils: A Field Guide to Selected Localities in Pennsylvanian, Permian, Cretaceous, and Tertiary Rocks of Texas and Related Papers. The School of Geoscience Louisiana State Universit, 1971.