Edlund, L. (1974). Modus Vetus: Sight Singing and ear-training in major/minor tonality / Lars Edlund. Hansen / Chester Music.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEdlund, Lars. Modus Vetus: Sight Singing and Ear-training in Major/minor Tonality / Lars Edlund. Stockholm/New York: Hansen / Chester Music, 1974.
एमएलए (8वां संस्करण) प्रशस्ति पत्रEdlund, Lars. Modus Vetus: Sight Singing and Ear-training in Major/minor Tonality / Lars Edlund. Hansen / Chester Music, 1974.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.