Respectfully Quoted: A Dictionary of Quotations. 1989.
Sir Halford John Mackinder (18611947)
When our Statesmen are in conversation with the defeated enemy, some airy cherub should whisper to them from time to time this saying: Who rules East Europe commands the Heartland: Who rules the Heartland commands the World-Island: Who rules the World-Island commands the World.
SIR HALFORD JOHN MACKINDER, Democratic Ideals and Reality: A Study in the Politics of Reconstruction, p. 186 (1919).