Tang Leang-li
George Routledge & Sons, 1930
Buku Teks
Borg, Dorothy
Macmillan, 1947
Buku Teks
Isaacs, Harold R.
Standford University Press, 1951
Buku Teks
Borg, Dorothy
Macmillan, 1947
Buku Teks
Isaacs, Harold R., author
Secker & Warburg, 1938
Buku Teks