Kooyman, G. L., & Lynch, W. (2013). Penguins: The animal answer guide. The Johns Hopkins University Press.
Dyfyniad Arddull ChicagoKooyman, Gerald L., and Wayne Lynch. Penguins: The Animal Answer Guide. Baltimore: The Johns Hopkins University Press, 2013.
Dyfyniad MLAKooyman, Gerald L., and Wayne Lynch. Penguins: The Animal Answer Guide. The Johns Hopkins University Press, 2013.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.