Pires, E. F. (2004). Sommerxylon spiralosus from Upper Triassic in southernmost Paraná Basin (Brazil): A new taxon with taxacean affinity. Academia Brasileira de Ciências.
Chicago Style (17th ed.) CitationPires, Etiene F. Sommerxylon Spiralosus from Upper Triassic in Southernmost Paraná Basin (Brazil): A New Taxon with Taxacean Affinity. Academia Brasileira de Ciências, 2004.
MLA (9th ed.) CitationPires, Etiene F. Sommerxylon Spiralosus from Upper Triassic in Southernmost Paraná Basin (Brazil): A New Taxon with Taxacean Affinity. Academia Brasileira de Ciências, 2004.
Warning: These citations may not always be 100% accurate.