Gaya APA

B.G.Tweedy, . et al (1990). Pesticide Residues and Food Safety A Harvest of Viewpoints . American Society: American Chemical Society, Washington,DC 1991.

Gaya MLA

B.G.Tweedy, . et al. "Pesticide Residues and Food Safety A Harvest of Viewpoints". American Society: American Chemical Society, Washington,DC 1991, 1990. Text.