Collinson, C. W. S. Field Book: Pennsylvanian Plant Fossils of Illinois.
Chicago Style (17th ed.) CitationCollinson, Charles William; Skartvedt. Field Book: Pennsylvanian Plant Fossils of Illinois.
MLA (9th ed.) CitationCollinson, Charles William; Skartvedt. Field Book: Pennsylvanian Plant Fossils of Illinois.
Warning: These citations may not always be 100% accurate.