Harrison, John B.
Alfred A. Knopf, 1966
Buku Teks SO
Kelly, J. M. (John Maurice)
Clarendon Press, 2005
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Aveling, Harry
2006
Artikel Jurnal
Sherry, John C.
Collier Books, 1963
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Lurier, Harold E.
Collier Books, 1963
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