On this day in 1999: Steffi Graf calls time on her tennis career | Borehamwood Times
Andre Agassi and Steffi Graf's love story: how their relationship began - 9Honey
Grand Slam Tennis Series - The Australian Open's Women Champions Between 1990 and 1999, Including Steffi Graf, Monica Seles, Mary Pierce, and Martina Hingis by Fort, Emeline, Stevens, Dakota - Amazon.ae
Steffi Graf (Sports Superstars Tennis Stars): Amazon.co.uk: Rothaus, James R.: 9780895657343: Books
TBT, 1999: A major statement from the Great Graf
Steffi Graf by Laura Hilgers (1990-10-03): Laura Hilgers: Amazon.com: Books