Burriss, Eli E.
Prentice-Hall, 1958
Buku Teks
Curtius, Ernst Robert
London Routledge & Kegan Paul [1953]
Buku Teks
Kessels, AHM
Hes Publisher, 1978
Buku Teks
American Society of Civil Engineers, 1988
Buku Referensi
Bateson, FW
Longmans , 1965
Buku Teks