Exhibition Helen Levitt (San Francisco, Calif.) : 1991, Phillips, S. S., Hambourg, M. M., & Levitt, H. (1991). Helen Levitt: [San Francisco Museum of Modern Art, 19.12.1991 - 15.3.1992; New York, 1.4. - 28.6.1992; Washington, DC, 24.7. - 18.10.1992.] / Sandra S. Phillips; Maria Morris Hambourg. San Francisco Museum of Modern Art.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিExhibition Helen Levitt (San Francisco, Calif.) : 1991, Sandra S. Phillips, Maria Morris Hambourg, এবং Helen Levitt. Helen Levitt: [San Francisco Museum of Modern Art, 19.12.1991 - 15.3.1992; New York, 1.4. - 28.6.1992; Washington, DC, 24.7. - 18.10.1992.] / Sandra S. Phillips; Maria Morris Hambourg. San Francisco, Calif.: San Francisco Museum of Modern Art, 1991.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিExhibition Helen Levitt (San Francisco, Calif.) : 1991, et al. Helen Levitt: [San Francisco Museum of Modern Art, 19.12.1991 - 15.3.1992; New York, 1.4. - 28.6.1992; Washington, DC, 24.7. - 18.10.1992.] / Sandra S. Phillips; Maria Morris Hambourg. San Francisco Museum of Modern Art, 1991.