Sánchez, B. B. (2008). A review of the crinoid columnals (Echinodermata-Crinoidea) from the Carboniferous of Mexico. Universidad de Costa Rica.
Citazione stile Chigago Style (17a edizione)Sánchez, B.E. Buitrón. A Review of the Crinoid Columnals (Echinodermata-Crinoidea) from the Carboniferous of Mexico. Universidad de Costa Rica, 2008.
Citatione MLA (9a ed.)Sánchez, B.E. Buitrón. A Review of the Crinoid Columnals (Echinodermata-Crinoidea) from the Carboniferous of Mexico. Universidad de Costa Rica, 2008.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.