Kurmann, Joseph A.; Rasic, Jeremija L.; Kroger, Manfred (1992), "Bircher Muesli", Encyclopedia of Fermented Fresh Milk Products: An International Inventory of Fermented Milk, Cream, Buttermilk, Whey, and Related Products (1ed.), Springer Verlag, p.75, ISBN978-0-442-00869-7, archived from the original on 2019-10-29, retrieved 2019-10-29
Kurmann, Joseph A.; Rasic, Jeremija L.; Kroger, Manfred (1992), "Bircher Muesli", Encyclopedia of Fermented Fresh Milk Products: An International Inventory of Fermented Milk, Cream, Buttermilk, Whey, and Related Products (1ed.), Springer Verlag, p.75, ISBN978-0-442-00869-7, archived from the original on 2019-10-29, retrieved 2019-10-29