APA

Purdue University, . (1981). Concrete pavement design. Second international conference. Proceedings, West Lafayette, IN, April 14-16 1981. West Lafayette, IN: Purdue University.

Chicago

Purdue University, . 1981. Concrete pavement design. Second international conference. Proceedings, West Lafayette, IN, April 14-16 1981. West Lafayette, IN: Purdue University.

Harvard

Purdue University, . (1981). Concrete pavement design. Second international conference. Proceedings, West Lafayette, IN, April 14-16 1981. West Lafayette, IN: Purdue University.

MLA

Purdue University, . Concrete pavement design. Second international conference. Proceedings, West Lafayette, IN, April 14-16 1981. West Lafayette, IN: Purdue University. 1981.