Não informado. (1975). Quarterly progress and status report. Royal Institute of Technology, Department of Speech Communication and Music Accoustics.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Quarterly Progress and Status Report. Stockholm: Royal Institute of Technology, Department of Speech Communication and Music Accoustics, 1975.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Quarterly Progress and Status Report. Royal Institute of Technology, Department of Speech Communication and Music Accoustics, 1975.
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