"Zeitschrift." . . . . "Gesangstechnik." . . . . "Periodicals" . "Periodicals"@en . "N A T S journal"@en . . . . . . . . "National Association of Teachers of Singing journal" . "National Association of Teachers of Singing journal"@en . "The NATS journal" . "The NATS journal"@en . . . . . . "Singen." . .