APA

Indian Roads Congress, . (1968). Standard letters and numerals of different heights for use on highway signs (in metric units). New Delhi: Indian Roads Congress.

Chicago

Indian Roads Congress, . 1968. Standard letters and numerals of different heights for use on highway signs (in metric units). New Delhi: Indian Roads Congress.

Harvard

Indian Roads Congress, . (1968). Standard letters and numerals of different heights for use on highway signs (in metric units). New Delhi: Indian Roads Congress.

MLA

Indian Roads Congress, . Standard letters and numerals of different heights for use on highway signs (in metric units). New Delhi: Indian Roads Congress. 1968.