"Canada's Underground World of Human Trafficking"@en . . "Invisible Chains:"@en . "Invisible Chains: Canada's Underground World of Human Trafficking is a 2010 book about human trafficking by Benjamin Perrin. Perrin wrote the book after researching human trafficking for ten years. In Invisibe Chains, Perrin recounts a variety of stories of human trafficking in Canada, including that of the prostitution of a child in Ontario whose sexual services were advertised in the adult services section of Craigslist."@en . "0143178970" . . .