Vierkandt, Alfred, 1867-1953, author
Stuttgart, Ferdinand Enke Verlag
Buku Referensi
Russell, Bertrand, 1872-1970, author
London George Allen & Unwin 1947
Buku Teks
Umar Junus, author
Kuala Lumpur Dewan Bahasa dan Pustaka 1986
Buku Teks
Korea : the Korean Sociological Association
Majalah, Jurnal, Buletin
Buku Teks