Brookshear, J. Glenn
Benjamin/Cummings Publishing, Company, Inc., 1994
Buku Teks
Brookshear, J. Glenn
Pearson, 2019
Buku Teks
American Association for the Advancement of Science, 2018
Majalah, Jurnal, Buletin
Geoff Green, Ken Petford, Alan Short, David Walker
John Muray, 1975
Buku Referensi
Derry, Gregory N.
Princeton University Press , 1999
Buku Teks SO