PEURIFOY, R. L., & LEDBETTER, W. B. (1985). Construction planning, equipment and methods.-- Ed.4. McGraw-Hill.

PEURIFOY, Robert L., and Wiliiam B. LEDBETTER. Construction Planning, Equipment and Methods.-- Ed.4. New York: McGraw-Hill, 1985.

PEURIFOY, Robert L., and Wiliiam B. LEDBETTER. Construction Planning, Equipment and Methods.-- Ed.4. McGraw-Hill, 1985.