Gaya APA
aji, P, P. (2008).
an analisa study sma assalaam students dificulties of mastering biology and it's solution .
:
assalaam press.
Gaya MLA
aji, Priatma, Pramantyo.
"an analisa study sma assalaam students dificulties of mastering biology and it's solution".
:
assalaam press,
2008.
.