Cita APA (7a ed.)
Kesling, R. V., & Smith, R. N. (1962). Gennaeocrinus variabilis, a new species of crinoid from the middle devonian bell shale of Michigan.
Cita Chicago Style (17a ed.)
Kesling, Robert V., y Raymond N. Smith. Gennaeocrinus Variabilis, a New Species of Crinoid from the Middle Devonian Bell Shale of Michigan. 1962.
Cita MLA (9a ed.)
Kesling, Robert V., y Raymond N. Smith. Gennaeocrinus Variabilis, a New Species of Crinoid from the Middle Devonian Bell Shale of Michigan. 1962.
Precaución: Estas citas no son 100% exactas.