The H.W. Wilson Company, 1953
Buku Teks
edited by Denise Folliot
Oxford University Press, 1954
Buku Teks
Farah Maulida, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2014
UI - Makalah dan Kertas Kerja
edited by Hary Beckman
Year Book Publishers, 1951
Buku Teks
Trager, Frank N., author
Frederick A. Preager, 1966
Buku Teks