Bunch of articles at milb.com. Hard to link to the main article, but scroll down from the AL Central article on the below link to see the main column, and the division info is below that
https://www.milb.com/milb/news/major-league-affiliate-overview-american-league-central
Worcester, Portland, Greenville, and Salem are the Red Sox AAA, AA, High A and Low A teams
https://www.milb.com/milb/news/major-league-affiliate-overview-american-league-central
Worcester, Portland, Greenville, and Salem are the Red Sox AAA, AA, High A and Low A teams