APA-referens

(2005). STANDARD METHODS FOR THE EXAMINATION OF WATER & WASTEWATER (21.). CENTENNIAL.

Chicago-stil citat

STANDARD METHODS FOR THE EXAMINATION OF WATER & WASTEWATER. 21. CENTENNIAL, 2005.

MLA-referens

STANDARD METHODS FOR THE EXAMINATION OF WATER & WASTEWATER. 21. CENTENNIAL, 2005.

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