APA Style
The difference of salivary pH before and after toothbrushing wiyh toothpaste containing betel leaf (piper betle). (2013).
:
Oxford.
MLA Style
The difference of salivary pH before and after toothbrushing wiyh toothpaste containing betel leaf (piper betle).
.
:
Oxford,
2013.
Skripsi.