APA

Asphalt Institute. Information Series nr 142 [IS-142], . (1968). Asphalt-paved shoulders for safety. College Park, MD: Asphalt Institute. Information Series nr 142 [IS-142].

Chicago

Asphalt Institute. Information Series nr 142 [IS-142], . 1968. Asphalt-paved shoulders for safety. College Park, MD: Asphalt Institute. Information Series nr 142 [IS-142].

Harvard

Asphalt Institute. Information Series nr 142 [IS-142], . (1968). Asphalt-paved shoulders for safety. College Park, MD: Asphalt Institute. Information Series nr 142 [IS-142].

MLA

Asphalt Institute. Information Series nr 142 [IS-142], . Asphalt-paved shoulders for safety. College Park, MD: Asphalt Institute. Information Series nr 142 [IS-142]. 1968.