Various - The Mirror of Literature, Amusement, and Instruction. Volume 14, No. 407, December 24, 1829 стр 3.

Soon after the publication of his "Specimens," he revisited Germany, and passed some time in Vienna, where he acquired a considerable knowledge of the Austrian court and its manners. He remained long at Bonn, where his friend, W.A. Schlegel, resides. Campbell returned to England in 1820, to undertake the editorship of the New Monthly Magazine