Cita APA

KREBS, R. D., & WALKER, R. D. (1971). Highway materials. McGraw-Hill.

Citación estilo Chicago

KREBS, Robert D., and Richard D. WALKER. Highway Materials. New York: McGraw-Hill, 1971.

Cita MLA

KREBS, Robert D., and Richard D. WALKER. Highway Materials. McGraw-Hill, 1971.

Warning: These citations may not always be 100% accurate.