Edlund, L., & Stout, A. (1974). Modus vetus: Sight singing and ear-training in major/minor tonality. Nordiska musikforlaget.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEdlund, Lars, और Alan Stout. Modus Vetus: Sight Singing and Ear-training in Major/minor Tonality. Stockholm: Nordiska musikforlaget, 1974.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEdlund, Lars, और Alan Stout. Modus Vetus: Sight Singing and Ear-training in Major/minor Tonality. Nordiska musikforlaget, 1974.
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