APA (7th ed.) Citation

Reader's Digest Association. (1993). When, where, why and how it happened. Reader's Digest Association.

Chicago Style (17th ed.) Citation

Reader's Digest Association. When, Where, Why and How It Happened. London: Reader's Digest Association, 1993.

MLA (9th ed.) Citation

Reader's Digest Association. When, Where, Why and How It Happened. Reader's Digest Association, 1993.