In his speech on depression, Dhavan said: "According to materials I located through a Google search, almost 20 million American adults suffer from a depressive illness serious enough to interfere with

In his speech on depression, Dhavan said: "According to materials I located through a Google search, almost 20 million American adults suffer from a depressive illness serious enough to interfere with their jobs and their family life." According to your textbook, did Dhavan make any mistakes in citing his sources?