Eva G. R. Taylor: A Letter Dated 1577 from Mercator to John Dee. In: Imago Mundi: The International Journal for the History of Cartography. Bd.13, Nr.1, 1956, S.56–68, doi:10.1080/03085695608592127 (alternativ: JSTOR:1150242).
Eva G. R. Taylor: A Letter Dated 1577 from Mercator to John Dee. In: Imago Mundi: The International Journal for the History of Cartography. Bd.13, Nr.1, 1956, S.56–68, doi:10.1080/03085695608592127 (alternativ: JSTOR:1150242).