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.