Oxford Clarendon Press [etc.] 1916
Buku Teks
Backman, Jules
The Brookings Institution, 1943
Buku Teks
edited by Sarah Tarlow and Susies West
Routledge, 1999
Buku Teks
Brittain, Herbert, Sir
George Allen and Unwin, 1959
Buku Teks
: B. T. Batsford, 1935
Buku Teks