SBP Board of Consultants & Engineers
Small Business Publications, [199?]
Buku Referensi
Baumeister, Theodore
McGraw-Hill, 1958
Buku Referensi
editor, Charles A. Harper
McGraw-Hill, 1970
Buku Referensi
Roberge
McGraw-Hill Book , 2000
Buku Teks
American Society for Testing and Materials
American Society for Testing and Materials, 1965
Buku Referensi