Gaya APA
Pirani, F., Roche, C.
(2001).
Mengenal Alam Semesta For Beginners
.
Jakarta:
Mizan.
Gaya MLA
Pirani, Felix., Roche, Christine.
"Mengenal Alam Semesta For Beginners".
Jakarta:
Mizan,
2001.
Text.