APA
Pacyna G., Zdebska D. & Czyżewska K. (2010). Upper Carboniferous seed fern (Pteridospermophyta) pollen organs from Silesia (Poland) and related evolution considerations. Łódź: Polish Botanical Society.
Chicago
Pacyna Grzegorz, Zdebska Danuta and Czyżewska Krystyna. 2010. Upper Carboniferous seed fern (Pteridospermophyta) pollen organs from Silesia (Poland) and related evolution considerations. Łódź: Polish Botanical Society.
Harvard
Pacyna G., Zdebska D. and Czyżewska K. (2010). Upper Carboniferous seed fern (Pteridospermophyta) pollen organs from Silesia (Poland) and related evolution considerations. Łódź: Polish Botanical Society.
MLA
Pacyna Grzegorz, Zdebska Danuta and Czyżewska Krystyna. Upper Carboniferous seed fern (Pteridospermophyta) pollen organs from Silesia (Poland) and related evolution considerations. Łódź: Polish Botanical Society. 2010.