Jahr, Ernst Hakon, author
Edinburgh University Press Ltd, 2014
eBooks
daab, 2007
Buku Referensi
Hutchinson, R.C., author
Farrar & Rinehart, 1940
Koleksi Publik
Hunt, George M., author
McGraw-Hill, 1967
Buku Teks
Weston, Christine, author
Charles Scribner's Sons, 1946
Buku Teks