National Productivity Board and National Productivity Association. (1986). Productivity digest (Singapore). Singapore: National Productivity Board and National Productivity Association.
Styl ChicagoNational Productivity Board and National Productivity Association. Productivity Digest (Singapore). Singapore: National Productivity Board and National Productivity Association, 1986.
Citace podle MLANational Productivity Board and National Productivity Association. Productivity Digest (Singapore). Singapore: National Productivity Board and National Productivity Association, 1986.
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