Kim, Jung-Gun
Conflict of international obligations and state interest / Jung-Gun Kim and John M. Howell
Martinus Nijhoff, 1972
 Buku Teks
Arie Afriansyah
The adequacy of international legal obligations for environmental protection during armed conflict / Arie Afriansyah
University of Indonesia, Faculty of Law, 2013
 Artikel Jurnal
Pearce, Robert
The law of Trusts and Equitable Obligations
Butterworth, 1998
 Buku Teks
Cracknell, D.G.
Obligations: Contract law
Old Bailey Press, 2002
 Buku Teks
Hukum perikatan : law of obligations
Rosa Agustina, Hans Nieuwenhuis, Jaap Hijma, dan Suharnoko
Universitas Indonesia, 2012
 Buku Teks