
Source: Sustainable History and the Dignity of Man (2009), p.14
Source: Language in Thought and Action (1949), The Pooling of Knowledge, p. 14
Source: Sustainable History and the Dignity of Man (2009), p.14
Cooperation among Animals with Human Implications (1951), page 213 (cited in "The Altruism Equation", by Lee Alan Dugatkin (2006), page 58).
Source: Excerpts of Martial law speech (14 December 1981)
Pg. 246
From 1980s onwards, Critical Path (1981)