Gaya APA
VALLES, C, G., Koen, W.
(1998.).
Seni memilih = art of choosing
.
Yogyakarta ::
Kanisius,.
Gaya MLA
VALLES, Carlos, G.., Koen, Willie.
"Seni memilih = art of choosing".
Yogyakarta ::
Kanisius,,
1998..
Text.