Gaya APA

Stream ecology and self-purification : an introduction for wastewater and water specialists / Frank R. Spellman. (1996). : Lancaster : Technomic Publishing.

Gaya MLA

Stream ecology and self-purification : an introduction for wastewater and water specialists / Frank R. Spellman. Ed. Ke- 2. : Lancaster : Technomic Publishing, 1996. Text.