Gaya APA

Havers, J, A., Jr., F, W, S. (1971). Handbook of Heavy Construction (Second Edition). United States of America: The Mcgraw-hill Companies.

Gaya MLA

Havers, John, A.., Jr., Frank, W., Stubbs,. "Handbook of Heavy Construction". Second Edition United States of America: The Mcgraw-hill Companies, 1971. REF.