Schaeffer, B., Dunkle, D. H., & MacDonald, N. G. (1975). Ptycholepis marshi Newberry: A chondrostean fish from the Newark Group of eastern north America.
Chicago Style (17th ed.) CitationSchaeffer, Bobb, David H. Dunkle, and Nicholas G. MacDonald. Ptycholepis Marshi Newberry: A Chondrostean Fish from the Newark Group of Eastern North America. Chicago, Ill, 1975.
MLA (9th ed.) CitationSchaeffer, Bobb, et al. Ptycholepis Marshi Newberry: A Chondrostean Fish from the Newark Group of Eastern North America. 1975.
Warning: These citations may not always be 100% accurate.