Jason Giambi announces retirement from MLB, calls career 'incredible journey' - ESPN
2018 Cal Poly Baseball Team Information Guide by Cal Poly Athletics - Issuu
Giambi delivers two-run homer…with Colorado Rockies down by three
Giambi's walkoff homer gives Rockies 10th straight victory – The Denver Post
2020 Oakland A's Media Guide, PDF, Major League Baseball
Jason Giambi Retires - MLB Trade Rumors
baseball prospects Waiting For Next Year
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Jason Giambi retires: A look back at his Athletics career - Athletics Nation
Jason Giambi announces his retirement in classy statement