Não informado. (1961). Water and wastes digest. Scranton Gillette Communications.
Lua i Stíl Chicago (17ú heag.)Não informado. Water and Wastes Digest. Chicago, Ill: Scranton Gillette Communications, 1961.
Lua MLA (8ú heag.)Não informado. Water and Wastes Digest. Scranton Gillette Communications, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.