Philippines. National Statistical Coordination Board. (1992). Philippine standard occupational classification, 1992. National Statistical Coordination Board.
Citace podle Chicago (17th ed.)Philippines. National Statistical Coordination Board. Philippine Standard Occupational Classification, 1992. Makati, Metro Manila: National Statistical Coordination Board, 1992.
Citace podle MLA (9th ed.)Philippines. National Statistical Coordination Board. Philippine Standard Occupational Classification, 1992. National Statistical Coordination Board, 1992.
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