Não informado. (1940). Bulletin of the Utah Engineering Experiment Station. Utah Engineering Experiment Station.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Bulletin of the Utah Engineering Experiment Station. Salt Lake City, Utah: Utah Engineering Experiment Station, 1940.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Bulletin of the Utah Engineering Experiment Station. Utah Engineering Experiment Station, 1940.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.