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Individui e mondi possibili, 1979 t.p. (R. Barcan Marcus) p. 225 (Ruth Barcan Marcus) bibliog. (Barcan Marcus, R.)
Info from Elsevier, Amsterdam, 12/4/85 (entry element is Barcan Marcus, Ruth; author preference)
Author's letter to LC, 02-04-93 (request to have name changed from Barcan Marcus, Ruth to Marcus, Ruth Barcan)
Yale daily news WWW site, Feb. 22, 2012 (in obituary published Feb. 21: Ruth Barcan Marcus, GRD '46; b. 1921, New York City; d. Sunday [Feb. 19, 2012], New Haven, aged 90; Yale professor of philosophy and pioneer in the field of quantified modal logic)
Jewish Women's Archive WWW site, Feb. 22, 2012 (Ruth Barcan Marcus; b. Ruth Barcan, Aug. 2, 1921, New York City; m. Jules Alexander Marcus, 1942 (div. 1976))
New York times WWW site, Mar. 15, 2012 (in obituary published Mar. 13: Ruth Barcan Marcus; b. Ruth Charlotte Barcan, Aug. 21, 1921, the Bronx; d. Feb. 19, New Haven, aged 90)