Solomon, Michael R., author
Prentice Hall International, 1997
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Solomon, Michael R., author
Pearson education, 2015
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Lovelock, Christopher H., author
Prentice-Hall, 2005
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Pundarika Lestari, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2014
UI - Tugas Akhir
Lovelock, Christopher H., author
Pearson Education , 2011
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