Arnot, Dorothy S.
Macmillan, 1962
Buku Teks
Monica Janowski, Tim Ingold.
Routledge, 2016
Buku Teks
Times Books, 1991
Buku Referensi
Beardsley, Charles
Charles E.Tuttle, 1967
Buku Teks
Petrov, Vladimir, author
American Institute fo Public Research, 1975
Buku Teks