Akehurst, M. (1976). Custom as a source of International Law, British Yearbook of International Law, 47, pp. 1-53.
Bederman, D.J. (2010). Custom as a Source of Law, Cambridge University Press.
Brownlie. J. (1998). The Rule of Law in International Affairs, The Hague: Martinus Nijhoff.
Byers , M. (1999). Custom, power, and power of Rules, Cambridge University press.
D'Amato, A, A. (1969). "The Concept Of Special Custom in International Law" , American Journal Of International Law. 63 (2), pp.211-223.
D'Amato, A, A. (1971). The Concept of Custom in International Law, Cornell University press, London.
Guzman, A. T. (2005). “Saving Customary International Law”, Michigan Journal of International Law.27 (1), pp. 115-176.
Jia, B. B. (2010). “The Relations between Treaties and Custom”, Chinese Journal of International Law.pp.81-109
Kolb. A. (2003). “Selected Problems in the Theory of Customary International Law”, Netherlands International Law Review. Pp.119-150
Kontorovich, E. (2007). “Inefficient Customs in International Law”, The Law School The University Of Chicago.
Kirgiz, F.L. (1987). Custom on a sliding scale, American Journal of international Law, 81.
Mac Gibbon. (1957). customary International law and Acquiescence, British Yearbook of international Law, 33.
Mendelson, M, H. (1998). The formation of Customary International Law, 272 Recuil des Cours: Collected Courses of the Hague Academy of International Law.
Petersen, N. (2007). “Customary Law without Custom? Rules, Principles, and the Role of the State Practice in International Norm Creation”, American University International Law Review. 23 (2), pp.275-310.
Postema, G. J. (2007). “Custom in international law: a normative practice account” in Amanda Perreau – Saussine and
Roberts. A. E. (2001). Traditional and Modern Approaches to Customary International law:A Reconciliation, The American Journal of International Law, 95 (2) ,pp. 757-791.
Walden, R. (1978). “Customary International Law: A Jurisprudential Analysis”, Israel Law Review, 13.
Wolfke, K. (1993). Custom in present international Law, Martinus Nijhoff publishers ,Netherlands.
Villiger, M, E (1997). Customary International Law and Treaties: A Manual on the Theory and Practice of Interrelation of Sources.
Judicial Cases:
ICJ, Asylum case (Colombia/Peru), 1950.
ICJ, Case concerning Legality of the threat or Use of Nuclear Weapons, 1996.
ICJ, Case concerning Military and paramilitary Activities in and against Nicaragua, Judgment of 27 June 1986.
ICJ, Case concerning North Sea continental shelf, 1969.
ICJ, Case Concerning Rights of United Nations National in Morocco, 1952.
ICJ, Case concerning the Arrest warrant of 11 April 2000 (DEMOCRATIC REPUBLIC OF THE CONGOY v. BELGIUM), 2002.
ICJ, Fisheries Case (United Kingdom v. Norway), 1951.
ICJ, Notte Bohm Case (LIECHTENSTEIN v. GUATEMALA), 1955.
PCIJ, Case certain German Interests in polish upper Silesia (Merits), series A, No7,1926.
PCIJ, Lotus case, series A, No.10, 1927.

Instrument:
Statement of Principles Applicable to the formation of General customary International Law, The international Law Association, Final Report of 69 td conference , London , 2000.
Wood , M, special Rapporteur, International Law commission . (2013). First report on formation and evidence of customary International Law, A/CN .4/663.
Wood, M, special Rapporteur, International Law commission. (2014). Second report on identification of customary International Low, A/CN. 4/672.
Draft Articles on Responsibility of states for International wrongful Acts, United Nations, International Law commission, fifty–third sessions, 2001.