Timber Engineering Company
F.W. Dodge Corp., 1956
Buku Referensi
edited by John A. Havers and Frank W. Stubbs, Jr.
McGraw-Hill, 1971
Buku Referensi
Ballast, David Kent
McGraw-Hill, 1994
Buku Referensi
King, Reno C.
McGraw-Hill, 1967
Buku Referensi
Smeaton, Robert W.
McGraw-Hill, 1969
Buku Referensi