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Dyfyniad Arddull ChicagoCameron, Elissa Z., and Sadie J. Ryan. "Welfare At Multiple Scales: Importance of Zoo Elephant Population Welfare in a World of Declining Wild Populations." PLoS One 2016.
Dyfyniad MLACameron, Elissa Z., and Sadie J. Ryan. "Welfare At Multiple Scales: Importance of Zoo Elephant Population Welfare in a World of Declining Wild Populations." PLoS One 2016.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.