- old-forum.warthunder.com index.php…PT-91 Twardy 9th Armored Cavalry Brigade on display. Note the Obra-1 LWS cylinders on the turret cheeks and behind the smoke launchers.
- itc.ua articles/polskye-tanky-pt-91-twardy-…
- zikipedia.herokuapp.com wiki/PT-91_TwardyPT-91 Twardy Polonya yapımı ana muharabe tankıdır. T-72M/M1 tankının geliştirilmesiyle ortaya çıkmıştır. T-72'nin geliştirilmiş varyantıdır.
- globalsecurity.org military/world/europe/pt-91-…PT-91 and its version T-72M1Z MBTs were designed to be highly reliable systems having superior firepower, improved crew protection and impressive mobility.
- armatec.bg products/pt-91-twardyThe PT-91 Twardy is a Polish main battle tank. A development of the T-72M1, it entered service in 1995.
- wikijtr.icu wiki/PT-91_TwardyPT-91 Twardy. Polonya Ordusu için üretim varyantı, T-72M1'in kapsamlı bir şekilde modernize edilmiş gelişimi.
- mezha.media en/2022/07/25/polish-tanks-pt-91-…To transform into the PT-91 Twardy T-72 received a new engine – a Polish diesel PZL-Wola S-1000R with a capacity of 1,000 hp.
- tr.mgwiki.top wiki/PT-91_TwardyPT-91 Twardy. Polonya Ordusu için üretim varyantı, T-72M1'in kapsamlı bir şekilde modernize edilmiş gelişimi.
- http://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.