Ward, Ian, author
Routledge. Cavendish. Taylor & Francis Group, 2004
Buku Teks
Levi, Edward H., author
London: The University of Chicago Press, 1949,
Buku Referensi
Robinson, O.F., author
Frofessional Books Limited, 1985
Buku Teks
Muhammad Hasan Izzurrahman, author
Sekolah Kajian Stratejik Dan Global Universitas Indonesia, 2022
UI - Tesis (Membership)
Fisher, Howard D., author
Cavendish Publishing Limited, 1999
Buku Teks