APA

First International Symposium, . (1969). Concrete bridge design. Michigan: American Concrete Institute.

Chicago

First International Symposium, . 1969. Concrete bridge design. Michigan: American Concrete Institute.

Harvard

First International Symposium, . (1969). Concrete bridge design. Michigan: American Concrete Institute.

MLA

First International Symposium, . Concrete bridge design. Michigan: American Concrete Institute. 1969.