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

"The Prime Ministers: An Intimate Narrative of Israeli Leadership" by Yehuda Avner
"The Prime Ministers: Reflections on Leadership from Wilson to May" by Steve Richards
"The Powers of the Prime Minister" by Michael Foley
"The British Prime Minister" by Robert Hazell
"The Guardian" newspaper's Politics section
"The Times" newspaper's Politics section
"BBC News" website's Politics section
"The Economist" magazine's Britain section
"New Statesman" magazine's Politics section
"The Spectator" magazine's Politics section