Thomson, K. S. (2009). The young Charles Darwin. Yale University Press.
Dyfyniad Arddull ChicagoThomson, Keith Stewart. The Young Charles Darwin. New Haven: Yale University Press, 2009.
Dyfyniad MLAThomson, Keith Stewart. The Young Charles Darwin. Yale University Press, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.