Friend, Bill personal comment 22 April 2004;
Friend, Theodore (1988). Blue Eyed Enemy. Princeton University Press. pp. 228 and 237. ISBN978-0-691-05524-4.;
Nyoman S. Pendit, Bali Berjuang (2nd edn Jakarta:Gunung Agung, 1979 [original edn 1954]); Reid (1973), page 58,n.25, page 119,n.7, page 120,n.17, page 148,n.25 and n.37; Pramoedya Anwar Toer, Koesalah Soebagyo Toer and Ediati Kamil Kronik Revolusi Indonesia [Jakarta: Kepustakaan Populer Gramedia, vol. I (1945); vol. II (1946) 1999; vol. III (1947); vol. IV (1948) 2003]; Ann Stoler, Capitalism and Confrontation in Sumatra's Plantation Belt, 1870–1979 (New Haven:Yale University Press, 1985), p103. ; all cited in Vickers (2005), page 100
George Mc.T Kahin (1980). "In Memoriam: Mohammad Hatta (1902–1980)". Indonesia. Southeast Asia Program Publications at Cornell University. 20 (20): 113–120. doi:10.2307/3350997. JSTOR3350997.
George Mc.T Kahin (1980). "In Memoriam: Mohammad Hatta (1902–1980)". Indonesia. Southeast Asia Program Publications at Cornell University. 20 (20): 113–120. doi:10.2307/3350997. JSTOR3350997.