Suyarkova, A. A., & Koren,Tatyana N. (2009). Advances in the Ordovician graptolite biostratigraphy of the St Petersburg area, Russia. Estonian Academy Publishers.
Chicago Style (17th ed.) CitationSuyarkova, Anna A., and Koren,Tatyana N. Advances in the Ordovician Graptolite Biostratigraphy of the St Petersburg Area, Russia. Estonian Academy Publishers, 2009.
MLA (8th ed.) CitationSuyarkova, Anna A., and Koren,Tatyana N. Advances in the Ordovician Graptolite Biostratigraphy of the St Petersburg Area, Russia. Estonian Academy Publishers, 2009.
Warning: These citations may not always be 100% accurate.