Sargent, Lyman Tower, author
Wadsworth , 2009
Buku Teks
Sargent, Lyman Tower, author
Thomson Wadsworth , 2006
Buku Teks
The Habibie Center,
Majalah, Jurnal, Buletin
edited by Robert E. Goodin, Charles Tilly
Oxford University Press, 2008
Buku Referensi
Insor, D., author
Frederick A.Praeger, 1963
Buku Teks