edited by Roland S. Young
Reinhold Publishing Corporation, 1960
Buku Teks
Schmid, A. Allan
Resources for The Future, 1968
Buku Teks
The Asphalt Institute
Maryland: The Asphalt Institute, 1974
Buku Teks
Sampson, Robert C.
Harper & Row, 1955
Buku Teks
Sale, Colin
Australian Government Publishing Service, 1975
Buku Teks