Skelton, H.J., author
London, H.J.Skelton
Buku Teks
Budi Darmawan, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1992
UI - Skripsi (Membership)
Johnson, William A., author
Harvard University Press, 1966
Buku Teks
Association of iron And Steel Engineers, 1984
Buku Teks
Tracy, Edward B.
Dodd, Mead, , 1971
Buku Teks