Gaya APA
Novianti, E, N. (2011).
Why? Experiment & Observation-Percobaan&Pengamatan .
jakarta:
PT Elex Media Komputindo.
Gaya MLA
Novianti, Endah, Nawang.
"Why? Experiment & Observation-Percobaan&Pengamatan".
jakarta:
PT Elex Media Komputindo,
2011.
Text.