McAllister, Pam (1982). Reweaving the Web of Life: Feminism and Nonviolence. New Society Publishers. p. 194. ISBN978-0-86571-017-7. สืบค้นเมื่อ 31 August 2013. Quote: "With love, Yours, Bapu (You closed with the term of endearment used by your close friends, the term you used with all the movement leaders, roughly meaning 'Papa.'" Another letter written in 1940 shows similar tenderness and caring.