Gaya APA

UTOMO, M. et al (2013). Long-term tillage and nitrogen fertilization effects on soil properties and crop yields . Lampung: Department of soil science faculty.

Gaya MLA

UTOMO, Muhajir. et al. "Long-term tillage and nitrogen fertilization effects on soil properties and crop yields". Lampung: Department of soil science faculty, 2013. Artikel.