Philippine Social Institute & Federation of Free Workers (Philippines). (1990). Philippine Social Institute: The educational arm of the Federation of Free Workers. Philippine Social Institute, Federation of Free Workers.
Chicago-viite (17. p.)Philippine Social Institute ja Federation of Free Workers (Philippines). Philippine Social Institute: The Educational Arm of the Federation of Free Workers. Manila: Philippine Social Institute, Federation of Free Workers, 1990.
MLA-viite (9. p.)Philippine Social Institute ja Federation of Free Workers (Philippines). Philippine Social Institute: The Educational Arm of the Federation of Free Workers. Philippine Social Institute, Federation of Free Workers, 1990.
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