APA (7th ed.) Citation

Maddison, A. (1989). The world economy in the 20th century. Organisation for Economic Co-operation and Development.

Chicago Style (17th ed.) Citation

Maddison, Angus. The World Economy in the 20th Century. Paris: Organisation for Economic Co-operation and Development, 1989.

MLA (9th ed.) Citation

Maddison, Angus. The World Economy in the 20th Century. Organisation for Economic Co-operation and Development, 1989.