APA (7th ed.) Citation

Donaldson, P. (1971). Worlds apart: The economic gulf between nations. Penguin Books.

Chicago Style (17th ed.) Citation

Donaldson, Peter. Worlds Apart: The Economic Gulf Between Nations. [Harmondsworth]: Penguin Books, 1971.

MLA (9th ed.) Citation

Donaldson, Peter. Worlds Apart: The Economic Gulf Between Nations. Penguin Books, 1971.

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