Beattie, C. N., author
Stevens & Sons Lim. , 1957
Buku Teks
Prentice-Hall, 1976
Buku Teks
Stanley, Joyce, 1901-, author
Warren, Gorham and Lamont, 1971
Buku Teks
Rizky Tri Putra, author
2014
UI - Skripsi (Membership)
Nasution, Akbar Maulana Rianda, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2014
UI - Skripsi (Membership)