edited by David L. Sills
Macmillan and The Free Press, 1968
Buku Referensi
Luthans, Fred, author
Macmillan, 1976
Buku Teks
Centre for International and Public Law, Australian National University, 1994
Buku Teks
Amsterdam John Benjamins B.V. 1979
Buku Teks
Artikel Jurnal