Lua APA (7ú heag.)
Duggal, K. N. (2002). Elements of environmental engineering (6th ed.). S. Chand.
Lua i Stíl Chicago (17ú heag.)
Duggal, K. N. Elements of Environmental Engineering. 6th ed. New Delhi: S. Chand, 2002.
Lua MLA (9ú heag.)
Duggal, K. N. Elements of Environmental Engineering. 6th ed. S. Chand, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.