To support claim a, we could try a scholarly work on recent political history; alternatively, members of a communist (or ex-communist) country might provide support from their experience. Personal memories might be relevant authority for claim b; other good sources of authority would be a history book or, to be precise, the government legislation enacted in that year that authorised the introduction of television (see chapter 8 on direct sources). Claim c would, again, draw upon historical or political books for authority. Claim d is probably too contentious for an authority to be widely available or accepted. Perhaps we could use a report by social, medical, or legal experts. Claim e, on the other hand, could again be sourced from a political or history book. Note, however, possible disagreements about the term 'main'. A doctor or a medical textbook would be two sources of authority for claim f.

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