Gaya APA

Harrington, W. et al (1991). Economics and episodic disease , the benefits of preventing a giardiasis outbreak . Washington DC: Resoues For the Future.

Gaya MLA

Harrington, Winston. et al. "Economics and episodic disease , the benefits of preventing a giardiasis outbreak". Washington DC: Resoues For the Future, 1991. Text.