APA aipamena

KREBS, R. D. (1971). Highway Materials. McGraw-Hill.

Chicago Style aipamena

KREBS, Robert D. Highway Materials. McGraw-Hill, 1971.

MLA aipamena

KREBS, Robert D. Highway Materials. McGraw-Hill, 1971.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.