found: Smithsonian Amer. Art Mus./Nat. Portrait Gallery Library vertical file(from 1989 exhibition announcement: Gretta Bader)
found: National Building Museum Web site, Feb. 19, 2002(from Blueprints magazine, winter 1986: Gretta Bader; sculptor)
found: U.S. Dept. of State Web site, Feb. 19, 2002(from Nov. 23, 1999 press release: Gretta Lange Bader, wife of William B. Bader; sculptor; B.A., Pomona College, 1953)
found: Pomona College Museum of Art Web site, Feb. 25, 2002(Gretta Lange Bader; advisory committee; class of 1953)
found: Washington post WWW site, Aug. 11, 2014(Gretta Bader; Margaret Marie Lange was born in Glen Ridge, N.J., on May 25, 1931; her mother's name was also Margaret, and she became known as Gretta from an early age; died Aug. 1 [2014] at her home in the District [of Columbia], at 83; portrait sculptor known for her ability to capture the likenesses of well-known figures in bronze; during a three-decade career that began in 1973, she had commissions for more than 30 portrait sculptures; early in her career, Mrs. Bader was interested in abstract art and turned to realistic portrait sculpture only after she became a full-time artist in the 1970s)