Não informado. Topographic instructions of the United States Geological Survey. U.S. Department of the Interior.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Topographic Instructions of the United States Geological Survey. Washington: U.S. Department of the Interior.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Topographic Instructions of the United States Geological Survey. U.S. Department of the Interior.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.