edited by Albert D. van Nostrand and Charles H. Watts
Library Arts Press, 1959
Buku Teks
Bush, Douglas
Clarendom Press , 1962
Buku Teks
Liberal Arts Press,, 1959
Buku Teks
Ashley, Maurice
Penguin Books, 1952
Buku Teks
Grierson, Herbert John Clifford, Sir, 1866-1960
Clarendon Press, 1958
Buku Teks