Quezon City: Garotech Publishing Inc. p. 83. ISBN 971-10-2415-2. ↑ Native Labour Regulations, section 1, 1899, Lisbon; in Gordon White, Robin Murray, and Christina White, Eds., Revolutionary Socialist Development in the Third World. 1983; Sussex, U.K.; Wheatsheaf Books. p.77. ↑ Marx, Karl (1967).