APA (7th ed.) Citation

Richardson, H. W. (1969). Elements of regional economics. Penguin Books.

Chicago Style (17th ed.) Citation

Richardson, Harry Ward. Elements of Regional Economics. Harmondsworth [etc.]: Penguin Books, 1969.

MLA (9th ed.) Citation

Richardson, Harry Ward. Elements of Regional Economics. Penguin Books, 1969.

Warning: These citations may not always be 100% accurate.