Searles, William H., author
John Wiley & Sons, 1949
Buku Referensi
edited by John A. Havers and Frank W. Stubbs, Jr.
McGraw-Hill, 1971
Buku Referensi
Timber Engineering Company
F.W. Dodge Corp., 1956
Buku Referensi
Ballast, David Kent, author
McGraw-Hill, 1994
Buku Referensi
King, Reno C., author
McGraw-Hill, 1967
Buku Referensi