Smith, Alpheus W., author
McGraw-Hill, 1979
Buku Teks
Martin, Martin C., author
Pergamon Press, 1975
Buku Teks
Holum, John R., author
John Wiley & Sons, 1995
Buku Teks
Knight, Randall D., author
Pearson-Addison Wesley, 2008
Buku Teks
Trewartha, Glenn T., author
McGraw-Hill, 1967
Buku Teks