APA
International Labour Office (Geneva), International Labour Office (Geneva), . (1976). Payment by results. : .
Chicago
International Labour Office (Geneva), International Labour Office (Geneva), . 1976. Payment by results. : .
Harvard
International Labour Office (Geneva), International Labour Office (Geneva), . (1976). Payment by results. : .
MLA
International Labour Office (Geneva), International Labour Office (Geneva), . Payment by results. : . 1976.
