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.