Papua New Guinea. Department of Public Works. (1972). Papua New Guinea road classification and design standards: Rural roads. Dept. of Public Works.
Chicagoスタイル(17版)引用形式Papua New Guinea. Department of Public Works. Papua New Guinea Road Classification and Design Standards: Rural Roads. [Port Moresby]: Dept. of Public Works, 1972.
MLA(9版)引用形式Papua New Guinea. Department of Public Works. Papua New Guinea Road Classification and Design Standards: Rural Roads. Dept. of Public Works, 1972.
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