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Delmar Cengage Learning, 2013
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Marrelli, Tina M.
Elsevier Mosby, 2012
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Harrington, Michael
Jones & Bartlett Learning, 2015
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Harrington, Michael K.
Jones & Bartlett Learning, 2016
Buku Teks
Hart, Andrew
Routledge, 1997
Buku Referensi