- tr.mgwiki.top wiki/PT-91_TwardyPT-91 Twardy. Polonya Ordusu için üretim varyantı, T-72M1'in kapsamlı bir şekilde modernize edilmiş gelişimi.
- britmodeller.com forums/index.php…Hello PT-91 TWARDY (in english hard or tough) is a Polish deep modernisation of the T-72 tank developed in the early 1990s.
- 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.
- tr.wiki7.org wiki/PT-91PT-91 Twardy ("Katı"), Sovyet T-72M1'in lisanslı bir versiyonuna dayanan bir Polonya ana muharebe tankıdır . İlk prototipler 1993 yılında yapıldı.
- wiki2.org en/PT-91_TwardyPolish Army PT-91 Twardy Tanks Maneuver. The Frankenstein Monster Tank that is Pounding Russia.
- defencetalk.com military/photos/c/pt-91-twardy-…Pictures of the Polish Army PT-91 Twardy Tank. ... T-72M1 (Poland) 29. Leopard 2 (Poland) 42. PT-91 Twardy (Poland) 10. Artillery 73.
- reddit.com r/wargame/comments/peegyl/pt91_twardy/Dzień dobry, The unit today is the PT-91 TWARDY (Fig.1), Poland’s best tank in Wargame: Red Dragon. ‘Twardy’ translates as hard/tough.
- 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.
- en-academic.com dic.nsf/enwiki/11873795The PT-91 Twardy ("hard","tough" or "resilient") is a Polish main battle tank. It is a development of the T-72M1 and first entered service in 1995.