September 24, 1984: Cubs clinch first postseason berth since 1945
Wrigley100 -- Chicago Tribune
Go Cubs Go' must go – Hartford Courant
MLB's longest division title droughts
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Cubs VS Pirates Sept 24 1984 NL East Clincher
August 24, 1918: Cubs clinch fifth National League pennant in 13 years with doubleheader sweep – Society for American Baseball Research
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Chicago Cubs' historic rally answers doubts, clinches NLCS spot - Sports Illustrated
Pirates Clinch First Playoff Berth in 21 Years with 2-1 Win over Cubs, News, Scores, Highlights, Stats, and Rumors
Wrigley100 -- Chicago Tribune
MLB's longest division title droughts
TBT: 1984 Cubs clinch first crown in 39 years
Wrigley100 -- Chicago Tribune
1984 NLCS Gm1: Cubs get first playoff win since 1945
