Attlee, C.R.
Heineman, 1954
Buku Teks
Morrison, Herbert, author
Oxford University Press, 1960
Buku Teks
Cronin, James E., author
Routledge, 1991
Buku Teks
Campbell-Johnson, Alan, author
Ives Washburn, 1955
Buku Teks
Gooch, R.K. (Robert Kent), 1893-1982, author
D. Van Nostrad, 1937
Buku Teks