Beeby, A., & Brennan, A. (2004). First ecology (2nd ed.). Oxford University Press.
Dyfyniad Arddull ChicagoBeeby, Alan, and Anne-Maria Brennan. First Ecology. 2nd ed. Oxford: Oxford University Press, 2004.
Dyfyniad MLABeeby, Alan, and Anne-Maria Brennan. First Ecology. 2nd ed. Oxford University Press, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.