B., L., W., L., P., R.(1985).Construction planning, equipment and methods / Robert L. Peurifoy, William B. Ledbetter (Ed.ke-4).:McGraw-Hill.
Gaya MLA
Ledbetter, William, B.., Peurifoy, Robert, L.."Construction planning, equipment and methods / Robert L. Peurifoy, William B. Ledbetter".Ed.ke-4:McGraw-Hill,1985.Textbook.