Klecka, William R.
McGraw-Hill, 1975
Buku Teks
Lalanne, Christophe
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Buku Teks
Najmah
Salemba Medika, 2017
Buku Teks
Kirkpatrick, Lee A.
Wadsworth and Cengage Learning, 2011
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Field, Andy P
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Buku Teks SO