American Association for the Advancement of Science, 2018
Majalah, Jurnal, Buletin
Butterfield, Herbert
Free Press, 1957
Buku Teks SO
by Geoff Green ... [and others]
John Murray, 1976
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Tillery, Bill W.
McGraw-Hill, 2013
Buku Teks SO
Derry, Gregory N.
Princeton University Press , 1999
Buku Teks SO