APA

Transport and Road Research Laboratory, Road note 31, . (1977). Guide to the structural design of bitumen-surfaced roads in tropical and sub-tropical countries. London: Transport and Road Research Laboratory.

Chicago

Transport and Road Research Laboratory, Road note 31, . 1977. Guide to the structural design of bitumen-surfaced roads in tropical and sub-tropical countries. London: Transport and Road Research Laboratory.

Harvard

Transport and Road Research Laboratory, Road note 31, . (1977). Guide to the structural design of bitumen-surfaced roads in tropical and sub-tropical countries. London: Transport and Road Research Laboratory.

MLA

Transport and Road Research Laboratory, Road note 31, . Guide to the structural design of bitumen-surfaced roads in tropical and sub-tropical countries. London: Transport and Road Research Laboratory. 1977.