Gaya APA

Petts, , R. (1982). PRACTICAL GUIDELINES FOR RURAL ROAD MAINTENANCE: Vol IV of IV Maintenance of Structures and Traffic Control Devices . Germany: Piarc.

Gaya MLA

Petts, , R.C.. "PRACTICAL GUIDELINES FOR RURAL ROAD MAINTENANCE: Vol IV of IV Maintenance of Structures and Traffic Control Devices". Germany: Piarc, 1982. Text.