Gamow, George
Biography of the earth : its pasy, present and future
American Library Association, 1965
 Buku Teks SO
Briggs, Lawrence Palmer
Transactions of the American philosophical society
The American Philosophical Society, 1951
 Buku Teks SO
Advancing rule of law in a global context
CRC press, 2020
 eBooks
Current issues in the social sciences and humanities
edited by the London office of Hosein University
Hosei University , 1996
 Buku Teks SO
H. Hartomo
lmu sosial dasar : (MKDU)
Bumi Aksara, 2004
 Buku Teks SO