Which sources of data did Bill James use for his early Baseball Abstract studies?

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Green retro manual baseball scoreboard beyond an empty, neatly mowed baseball field with brown infield dirt and striped grass outfield. — Sabermetrics A scoreboard provides some – but not necessarily the most useful – data on player and team performances in baseball.

For his early Baseball Abstract studies, Bill James primarily utilized information he gathered from two main sources: The Baseball Encyclopedia and the box scores found in The Sporting News.1

These foundational publications provided the raw data that allowed James to perform the original statistical analyses that would eventually define the field of sabermetrics.