Price, Charles Archibald
Australian Institute of International Affairs in association with Australian National University Press, 1974
Buku Teks
Clark, William S.
Houghton-Miffiln, 1987
Buku Teks
Cassara, Ernestt
Gale Research Coompany, 1977
Buku Teks
Chielens, Edward E.
Gale Research, 1975
Buku Teks
William Clowes and Sons , 1959
Buku Teks