APA
"UN E. C. f. E., "UN E. C. f. E., . (1987). "Guide on drawing up international contracts for services relating to maintanance, repair and reperation of industrial and works.". NY: UN USA.
Chicago
"UN Economic Commission for Europe.", "UN Economic Commission for Europe.", . 1987. "Guide on drawing up international contracts for services relating to maintanance, repair and reperation of industrial and works.". NY: UN USA.
Harvard
"UN E. C. f. E., "UN E. C. f. E., . (1987). "Guide on drawing up international contracts for services relating to maintanance, repair and reperation of industrial and works.". NY: UN USA.
MLA
"UN Economic Commission for Europe.", "UN Economic Commission for Europe.", . "Guide on drawing up international contracts for services relating to maintanance, repair and reperation of industrial and works.". NY: UN USA. 1987.
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