Reader's Digest great events of the 20th century :
how they changed our lives.
APA Citation
Reader's Digest Association. (1977). Reader's Digest great events of the 20th century: how they changed our lives. Pleasantville, N.Y.: Reader's Digest Association.
MLA Citation
Reader's Digest Association. Reader's Digest Great Events of the 20th Century: How They Changed Our Lives. Pleasantville, N.Y.: Reader's Digest Association, 1977.
Warning: These citations may not always be complete (especially for serials).