Παραπομπή APA

Southern, R. (1973). Road transport in the New Guinea highlands. Port Moresby: Department of Geography.

Παραπομπή Chicago Style

Southern, Roger. Road Transport in the New Guinea Highlands. Port Moresby: Department of Geography, 1973.

Παραπομπή MLA

Southern, Roger. Road Transport in the New Guinea Highlands. Port Moresby: Department of Geography, 1973.

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