Sinotech Engineering Consultants. (1987). Detailed engineering planning (phase III A) for WPP/SKP IV/C, D, I & J Singkawang: Final report. Sinotech Engineering Consultants.
Lua i Stíl Chicago (17ú heag.)Sinotech Engineering Consultants. Detailed Engineering Planning (phase III A) for WPP/SKP IV/C, D, I & J Singkawang: Final Report. [Jakarta]: Sinotech Engineering Consultants, 1987.
Lua MLA (8ú heag.)Sinotech Engineering Consultants. Detailed Engineering Planning (phase III A) for WPP/SKP IV/C, D, I & J Singkawang: Final Report. Sinotech Engineering Consultants, 1987.
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