Blake, L. S. (1975). Civil engineer's reference book. London : Butterworths.
Cita Chicago (17th ed.)Blake, L. S. Civil Engineer's Reference Book. London : Butterworths, 1975.
Cita MLA (9th ed.)Blake, L. S. Civil Engineer's Reference Book. London : Butterworths, 1975.
Atenció: Aquestes cites poden no estar 100% correctes.