Eberhard, Wolfram, 1909-1989
Routledge & Kegan Paul, 1952
Buku Teks SO
White, Lynn
Oxford University Press, 1962
Buku Teks SO
Du Bois, Cora Alice, 1903-1991
University of Minesota Press, 1949
Buku Teks
edited by Sydney Nettleton Fisher
Cornell University Press , 1955
Buku Teks
Lo, Chi
Emerald, 2017
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