Gaya APA

PURNOMO, D. et al (2012). Potential of varies trees litter containing tannin on agroforestry system as nitrification inhibitor . USA: EL.Monte - USA.

Gaya MLA

PURNOMO, Djoko. et al. "Potential of varies trees litter containing tannin on agroforestry system as nitrification inhibitor". USA: EL.Monte - USA, 2012. Artikel.