Lewis, Norman
Dictionary of correct spelling : a handy reference guide
Harper & Row , 1962
 Buku Referensi
The world of ideas
edited by Michael W. Alssid and William Kenney
Halt, Rinchart and Winston, 1964
 Buku Teks SO
Mitchell, H.B.
Data fusion: concepts and ideas
[Springer, Springer], 2012
 eBooks
Magstadt, Thomas M.
Understanding politics : ideas, institutions, and issues
Wadsworth-Cengage learning, 2009
 Buku Teks SO
Magstadt, Thomas M.
Understanding politics : ideas, institutions, and issues
Cengage Learning, 2017
 Buku Teks