APA

PTRC Proceedings no 177 of seminar F, . (1979). Highway design and maintenance in developing countries. London: PTRC Proceedings no 177 of seminar F.

Chicago

PTRC Proceedings no 177 of seminar F, . 1979. Highway design and maintenance in developing countries. London: PTRC Proceedings no 177 of seminar F.

Harvard

PTRC Proceedings no 177 of seminar F, . (1979). Highway design and maintenance in developing countries. London: PTRC Proceedings no 177 of seminar F.

MLA

PTRC Proceedings no 177 of seminar F, . Highway design and maintenance in developing countries. London: PTRC Proceedings no 177 of seminar F. 1979.