Gaya APA
NAPOLEON, H. et al
(2009).
Keys to positive thinking :
(
cet. 2)
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Jakarta:
Bhuana Ilmu Populer.
Gaya MLA
NAPOLEON, Hill. et al.
"Keys to positive thinking :".
cet. 2
Jakarta:
Bhuana Ilmu Populer,
2009.
Buku.