- novayagazeta.eu articles/2023/01/27/polsha-…
- auto.24tv.ua ru/harakteristiki_polskih_tankov_pt_…PT-91 Twardy.
- vikna.tv ru/video/polsha-peredala-ukraine-tanki-…
- everything.explained.today PT-91_Twardy/PT-91 Twardy. Production variant for the Polish Army, an extensively modernized development of the T-72M1.
- wikiwand.com en/PT-91_TwardyPT-91 Twardy. Production variant for the Polish Army, an extensively modernized development of the T-72M1.
- owiki.org wiki/PT-91_TwardyPT-91 ''Twardy''. Production variant for Polish Army, extensively modernized development of T-72M1.
- sapientiatr.com PT-91_TwardyPT-91 Twardy Polonya yapımı ana muharabe tankıdır. T-72M/M1 tankının geliştirilmesiyle ortaya çıkmıştır. T-72'nin geliştirilmiş varyantıdır.
- turbosquid.com 3d-models/3d-pt-91-twardy-2171845Royalty free 3D model PT 91 Twardy for download as max on TurboSquid: 3D models for games, architecture, videos.
- army-guide.com eng/product179.htmlOn PT-91 "Twardy" chassis there was planed to produce recovery vehicle WZT-3, armed engineering vehicle and drivers training vehicle.