Não informado. Virginia agricultural economics. Virginia Polytechnic Institute, Department of Agricultural Economics and Rural Sociology.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Virginia Agricultural Economics. Blacksburg, Va: Virginia Polytechnic Institute, Department of Agricultural Economics and Rural Sociology.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Virginia Agricultural Economics. Virginia Polytechnic Institute, Department of Agricultural Economics and Rural Sociology.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.