<KREBS, R. D. &. R. W. Highway materials. McGraw-Hill Book Co.
Chicago Style (17th ed.) Citation<KREBS, Robert D & R.D. Walker>. Highway Materials. McGraw-Hill Book Co.
MLA (8th ed.) Citation<KREBS, Robert D & R.D. Walker>. Highway Materials. McGraw-Hill Book Co.
Warning: These citations may not always be 100% accurate.