Hamilton, Gordon, author
Uitgeverij Ploegsma, 1952
Buku Teks
Roussopulos, Dimitrios I
Black Rose Books, 1975
Buku Teks
Helen Jaspan, author
Gunung Agung, 1961
Buku Teks
Edward, Richard C., author
Prentice-Hall, 1972
Buku Teks
Irvine, Elizabeth E., author
Pergamon Press, 1979
Buku Teks