Lua APA (7ú heag.)

Não informado. (1950). Water and sanitary engineer. DR Publications.

Lua i Stíl Chicago (17ú heag.)

Não informado. Water and Sanitary Engineer. Surrey, Inglaterra: DR Publications, 1950.

Lua MLA (8ú heag.)

Não informado. Water and Sanitary Engineer. DR Publications, 1950.

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