APA
Brenning E., . (1973). Evaluation of reflectorized traffic sign materials under controlled rainfall conditions. Urbana, IL: Illinois University. Highway Traffic Safety Center. RR nr 7.
Chicago
Brenning ED, . 1973. Evaluation of reflectorized traffic sign materials under controlled rainfall conditions. Urbana, IL: Illinois University. Highway Traffic Safety Center. RR nr 7.
Harvard
Brenning E., . (1973). Evaluation of reflectorized traffic sign materials under controlled rainfall conditions. Urbana, IL: Illinois University. Highway Traffic Safety Center. RR nr 7.
MLA
Brenning ED, . Evaluation of reflectorized traffic sign materials under controlled rainfall conditions. Urbana, IL: Illinois University. Highway Traffic Safety Center. RR nr 7. 1973.