Gaya APA
Davis, M., L., Cornwell, D. (2008).
Introduction to environmental engineering (ed. 4th).
sidoarjo:
Akademi Komunitas Perkebunan Yogyakarta.
Gaya MLA
Davis, M., L., Cornwell, D..
Introduction to environmental engineering.
ed. 4th
sidoarjo:
Akademi Komunitas Perkebunan Yogyakarta,
2008.
Text.