Issel, L. Michele
Jones & Bartlett Learning, 2014
Buku Teks
Issel, L. Michele
Jones and Barlett Publ., 2004
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by W. R. Ferguson
Applied Science Publisher, 1973
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Leedy, Paul D.
Pearson Education, 2005
Buku Teks SO
Kerridge, Jon
Blackwell, 1987
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