What books magazines or news websites should you refer to when writing a survey about the introduction of British prime ministers and their powers

Books:

1. "The Prime Ministers: An Intimate Narrative of Israeli Leadership" by Yehuda Avner
2. "Prime Ministers and Presidential Politics in the UK" by Andrew Blick
3. "The Prime Ministers of Canada" by Gordon Donaldson

Magazines:

1. The Economist
2. The New Yorker
3. Time

News websites:

1. BBC News
2. The Guardian
3. The Telegraph