Gaya APA

HEXAGON, D, P, U. (1987). Geotechnical evaluation of sanitary landfill sites: final report . : DPU.

Gaya MLA

HEXAGON, DEPARTEMEN, PEKERJAAN, UMUM-KWARSA. "Geotechnical evaluation of sanitary landfill sites: final report". : DPU, 1987. Laporan.