1. A.Fox, et al. Elizabeth Ann Is The First Cloned Black-Footed Ferret. (22 Şubat 2021). Access Date: 16 Eylül 2023. Reference URL: https://www.smithsonianmag.com/smart-news/elizabeth-ann-first-cloned-black-footed-ferret-180977065/ Smithsonian Magazine
2. R. Fritts. The Surprising Reason Scientists Haven't Been Able To Clone A Bird Yet. (28 Nisan 2021). Access Date: 16 Eylül 2023. Reference URL: https://www.audubon.org/news/the-surprising-reason-scientists-havent-been-able-clone-bird-yet Audubon
3. A-Z Animals. Discover The 3 Reasons Why The Dodo Bird Went Extinct. Access Date: 16 Eylül 2023. Reference URL: https://a-z-animals.com/blog/discover-the-reasons-why-the-dodo-bird-went-extinct/ A-Z Animals