Cita APA (7th ed.)

Marek, L. (1961). The trilobite family Cyclopygidae Raymond in the Ordovician of Bohemia. Vydal Ustredni ustav geologicky.

Cita Chicago (17th ed.)

Marek, Ladislav. The Trilobite Family Cyclopygidae Raymond in the Ordovician of Bohemia. Praha: Vydal Ustredni ustav geologicky, 1961.

Cita MLA (8th ed.)

Marek, Ladislav. The Trilobite Family Cyclopygidae Raymond in the Ordovician of Bohemia. Vydal Ustredni ustav geologicky, 1961.