Gaya APA
Wattles, D, W., Purwoko, S.
(2008).
The science of getting rich
.
Jakarta:
PT Gramedia Pustaka Utama.
Gaya MLA
Wattles, D, Wallace., Purwoko, Susi.
"The science of getting rich".
Jakarta:
PT Gramedia Pustaka Utama,
2008.
Text.