Pease, Edward R., author
Frank Cass, 1963
Buku Teks
Morrison & Gibb, 1940
Buku Teks
Crosland, Anthony, 1918-, author
Macmillan, 1957
Buku Teks
Heartfield, James, author
Oxford University Press, 2017
eBooks
Hollis, Christopher, author
Hollis & Carter, 1949
Buku Teks