Não informado. (1991). Structural Engineering International. International Association for Bridge and Structural Engineering.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Structural Engineering International. Zurich, Suíça: International Association for Bridge and Structural Engineering, 1991.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Structural Engineering International. International Association for Bridge and Structural Engineering, 1991.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.