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Tajuddin, Teuku (2021). Bioteknologi(PDF). Tangerang Selatan: Universitas Terbuka. hlm. 1.52. ISBN9786233126496.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
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Fossen, Christian. "What is Biology?". www.ntnu.edu. Diarsipkan dari versi asli tanggal 2018-07-25. Diakses tanggal 2018-07-25.