Não informado. (1982). Environmental Research Center Papers. University of Tsukuba, Environmental Research Center.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Environmental Research Center Papers. Ibaraki, Japão: University of Tsukuba, Environmental Research Center, 1982.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Environmental Research Center Papers. University of Tsukuba, Environmental Research Center, 1982.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.