World's largest Sammy Sosa card collection? - Sports Collectors Digest
What is the best way to sell a large sports card collection from the 80s and 90s? - Quora
Gauging the Bonds market / Price of Giants slugger's memorabilia unlikely to catch up with McGwire's
Heritage Auctions
MORE
World's largest Sammy Sosa card collection? - Sports Collectors Digest
Sports Collectors Digest December 7, 2018 (Digital)
I'll go over the moon only once
SABR's Baseball Cards Research Committee – Page 38
TMN's Heros, Icons & Legends Auction by thememorabilianetwork - Issuu
Sammy Sosa: Top 10 Most Expensive Baseball Cards Sold on (December - February 2019)