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.