APA

Asphalt Institute. Information Series nr 137 [IS-137], . (1966). Railway roadbeds for tomorrow. College Park, MD: Asphalt Institute. Information Series nr 137 [IS-137].

Chicago

Asphalt Institute. Information Series nr 137 [IS-137], . 1966. Railway roadbeds for tomorrow. College Park, MD: Asphalt Institute. Information Series nr 137 [IS-137].

Harvard

Asphalt Institute. Information Series nr 137 [IS-137], . (1966). Railway roadbeds for tomorrow. College Park, MD: Asphalt Institute. Information Series nr 137 [IS-137].

MLA

Asphalt Institute. Information Series nr 137 [IS-137], . Railway roadbeds for tomorrow. College Park, MD: Asphalt Institute. Information Series nr 137 [IS-137]. 1966.