APA

PTRC Proceedings of seminar P. P 185, . (1979). Highway construction and maintenance. London: PTRC Proceedings of seminar P. P 185.

Chicago

PTRC Proceedings of seminar P. P 185, . 1979. Highway construction and maintenance. London: PTRC Proceedings of seminar P. P 185.

Harvard

PTRC Proceedings of seminar P. P 185, . (1979). Highway construction and maintenance. London: PTRC Proceedings of seminar P. P 185.

MLA

PTRC Proceedings of seminar P. P 185, . Highway construction and maintenance. London: PTRC Proceedings of seminar P. P 185. 1979.