Gaya APA
Chair, G, D, C, G, D. (2005).
Upgrading and retrofitting water and wastewater treatment plants.-- .
America:
.
Gaya MLA
Chair, G.T., Daigger., Chair,, G.T., Daigger..
"Upgrading and retrofitting water and wastewater treatment plants.--".
America:
,
2005.
Buku.