APA

Purdue University. Engineering bulletin. Engineering extension series nr 146, . (1975). Road school. Annual. 61. March 1975. Proceedings. West Lafayette, IN: Purdue University. Engineering bulletin. Engineering extension series nr 146.

Chicago

Purdue University. Engineering bulletin. Engineering extension series nr 146, . 1975. Road school. Annual. 61. March 1975. Proceedings. West Lafayette, IN: Purdue University. Engineering bulletin. Engineering extension series nr 146.

Harvard

Purdue University. Engineering bulletin. Engineering extension series nr 146, . (1975). Road school. Annual. 61. March 1975. Proceedings. West Lafayette, IN: Purdue University. Engineering bulletin. Engineering extension series nr 146.

MLA

Purdue University. Engineering bulletin. Engineering extension series nr 146, . Road school. Annual. 61. March 1975. Proceedings. West Lafayette, IN: Purdue University. Engineering bulletin. Engineering extension series nr 146. 1975.