Cita APA (7a ed.)

Collinson, C. W. S. Field Book: Pennsylvanian Plant Fossils of Illinois.

Cita Chicago Style (17a ed.)

Collinson, Charles William; Skartvedt. Field Book: Pennsylvanian Plant Fossils of Illinois.

Cita MLA (9a ed.)

Collinson, Charles William; Skartvedt. Field Book: Pennsylvanian Plant Fossils of Illinois.

Precaución: Estas citas no son 100% exactas.