Dorward, David
Australia Institute of international, 1989
Buku Teks
Handlin, Oscar, author
Atheneum, 1966
Buku Teks
Butler, David
Radius Book/ Hutchinson, 1970
Buku Teks
Aksara Persada Indonesia, 1986
Buku Teks
McDonald, Lee Cameron, author
Harcourt, Brace & World, 1968
Buku Teks