edited by Roland S. Young
Reinhold Publishing Corporation, 1960
Buku Teks SO
Schmid, A. Allan
Resources for The Future, 1968
Buku Teks SO
The Asphalt Institute
Maryland: The Asphalt Institute, 1974
Buku Teks
Sampson, Robert C.
Harper & Row, 1955
Buku Teks
Marryat, Frederick
Alfred A. Knopf, 1962
Buku Teks SO