Ben-Chai, David
Sense, 2012
eBooks
Phares Odaffer, Randall Charles, Thomas Cooney, John Dossey, Jane Schielack
Pearson Addison Wesley, 2008
Buku Teks
Garstens, Helen L.
Macmillan, 1969
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Renner, John W.
Harper & Row, 1968
Buku Teks
Sheffield, Linda Jensen
John Wiley & Sons, 2000
Buku Teks