APA
Highway Research Board, . (1971). Highway research record number 438 soil compaction and corrugation. Washington D.C: Highway Research Board.
Chicago
Highway Research Board, . 1971. Highway research record number 438 soil compaction and corrugation. Washington D.C: Highway Research Board.
Harvard
Highway Research Board, . (1971). Highway research record number 438 soil compaction and corrugation. Washington D.C: Highway Research Board.
MLA
Highway Research Board, . Highway research record number 438 soil compaction and corrugation. Washington D.C: Highway Research Board. 1971.