Sources

-https://armyrecognition.com/focus-analysis-conflicts/army/defence-security-industry-technology/russia-finally-starts-state-trials-of-the-bt-3f-amphibious-armored-vehicle-after-15-years-of-development
-https://en.wikipedia.org/wiki/Armoured_personnel_carrier
-https://www.kemhan.go.id/2019/04/22/ri-rusia-tandatangani-kontrak-pengadaan-kendaraan-tempur-dan-tank-angkut-personel.html
-https://en.topwar.ru/264890-razrabotannyj-na-baze-bmp-3-plavajuschij-gusenichnyj-bronetransporter-bt-3f-vyshel-na-jetap-gosudarstvennyh-ispytanij.html
-https://www.msn.com/en-nz/news/other/video-russia-begins-testing-of-the-new-amphibious-armored-vehicle-bt-3f/ar-AA1FcNgL
-https://www.oreanda-news.com/en/gosudarstvo/tests-of-floating-bt-3f-have-begun-in-russia/article1558732/