Não informado. (1972). Geographical survey. Ball State University, Department of Geography and Geology.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Geographical Survey. Muncie, Ind: Ball State University, Department of Geography and Geology, 1972.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Geographical Survey. Ball State University, Department of Geography and Geology, 1972.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.